# This Source Code Form is subject to the terms of the Mozilla Public # License, v. 2.0. If a copy of the MPL was not distributed with this # file, You can obtain one at http://mozilla.org/MPL/2.0/. */ # This file defines static prefs, i.e. those that are defined at startup and # used entirely or mostly from C++ and/or Rust code. # # The file is separated into sections, where each section contains a group of # prefs that all share the same first segment of their name -- all the "gfx.*" # prefs are together, all the "network.*" prefs are together, etc. Sections # must be kept in alphabetical order, but prefs within sections need not be. # # Basics # ------ # Any pref defined in one of the files included here should *not* be defined # in a data file such as all.js; that would just be useless duplication. # # (Except under unusual circumstances where the value defined here must be # overridden, e.g. for some Thunderbird prefs. In those cases the default # value from the data file will override the static default value defined # here.) # # Please follow the existing prefs naming convention when considering adding a # new pref, and don't create a new pref group unless it's appropriate and there # are likely to be multiple prefs within that group. (If you do, you'll need to # update the `pref_groups` variable in modules/libpref/moz.build.) # # Definitions # ----------- # A pref definition looks like this: # # - name: # mandatory # type: # mandatory # value: # mandatory # mirror: # mandatory # do_not_use_directly: # optional # include: # optional # rust: # optional # set_spidermonkey_pref: # optional # # - `name` is the name of the pref, without double-quotes, as it appears # in about:config. It is used in most libpref API functions (from both C++ # and JS code). # # - `type` is one of `bool`, `int32_t`, `uint32_t`, `float`, an atomic version # of one of those, `String` or `DataMutexString`. Note that float prefs are # stored internally as strings. The C++ preprocessor doesn't like template # syntax in a macro argument, so use the typedefs defined in # StaticPrefsBase.h; for example, use `RelaxedAtomicBool` instead of # `Atomic`. # # - `value` is the default value. Its type should be appropriate for # , otherwise the generated code will fail to compile. A complex # C++ numeric expressions like `60 * 60` (which the YAML parser cannot treat # as an integer or float) is treated as a string and passed through without # change, which is useful. # # - `mirror` indicates how the pref value is mirrored into a C++ variable. # # * `never`: There is no C++ mirror variable. The pref value can only be # accessed via the standard libpref API functions. # # * `once`: The pref value is mirrored into a variable at startup; the # mirror variable is left unchanged after that. (The exact point at which # all `once` mirror variables are set is when the first `once` mirror # variable is accessed, via its getter function.) This is mostly useful for # graphics prefs where we often don't want a new pref value to apply until # restart. Otherwise, this update policy is best avoided because its # behaviour can cause confusion and bugs. # # * `always`: The mirror variable is always kept in sync with the pref value. # This is the most common choice. # # When a mirror variable is present, a getter will be created that can access # it. Using the getter function to read the pref's value has the two # following advantages over the normal API functions. # # * A direct variable access is faster than a hash table lookup. # # * A mirror variable can be accessed off the main thread. If a pref *is* # accessed off the main thread, it should have an atomic type. Assertions # enforce this. # # Note that Rust code must access the mirror variable directly, rather than # via the getter function. # # - `do_not_use_directly` indicates if `_DoNotUseDirectly` should be appended to # the name of the getter function. This is simply a naming convention # indicating that there is some other wrapper getter function that should be # used in preference to the normal static pref getter. Defaults to `false` if # not present. Cannot be used with a `never` mirror value, because there is # no getter function in that case. # # - `include` names a header file that must be included for the pref value to # compile correctly, e.g. because it refers to a code constant. System # headers should be surrounded with angle brackets, e.g. ``. # # - `rust` indicates if the mirror variable is used by Rust code. If so, it # will be usable via the `static_prefs::pref!` macro, e.g. # `static_prefs::pref!("layout.css.cross-fade.enabled")`. # # - `set_spidermonkey_pref` indicates whether SpiderMonkey boilerplate code # should be generated for this pref. If this is set to 'startup', the # pref on the SpiderMonkey side is only set during process startup. If set to # 'always', the SpiderMonkey pref value is also updated when this pref is # changed at runtime. # This option is only valid for javascript.options.* prefs. # # The getter function's base name is the same as the pref's name, but with # '.' or '-' chars converted to '_', to make a valid identifier. For example, # the getter for `foo.bar_baz` is `foo_bar_baz()`. This is ugly but clear, # and you can search for both the pref name and the getter using the regexp # /foo.bar.baz/. Suffixes are added as follows: # # - If the `mirror` value is `once`, `_AtStartup` is appended, to indicate the # value was obtained at startup. # # - If the `do_not_use_directly` value is true, `_DoNotUseDirectly` is # appended. # # Preprocessor # ------------ # Note finally that this file is preprocessed by preprocessor.py, not the C++ # preprocessor. As a result, the following things may be surprising. # # - YAML comments start with a '#', so putting a comment on the same line as a # preprocessor directive is dubious. E.g. avoid lines like `#define X 3 # # three` because the ` # three` will be part of `X`. # # - '@' use is required for substitutions to occur. E.g. with `#define FOO 1`, # `FOO` won't be replaced with `1` unless it has '@' chars around it. # # - Spaces aren't permitted between the leading '#' and the name of a # directive, e.g. `#ifdef XYZ` works but `# ifdef XYZ` does not. # # Please indent all prefs defined within #ifdef/#ifndef conditions. This # improves readability, particular for conditional blocks that exceed a single # screen. But note that the leading '-' in a definition must remain in the # first column for it to be valid YAML. #ifdef RELEASE_OR_BETA #define IS_NOT_RELEASE_OR_BETA false #else #define IS_NOT_RELEASE_OR_BETA true #endif #ifdef NIGHTLY_BUILD #define IS_NIGHTLY_BUILD true #define IS_NOT_NIGHTLY_BUILD false #else #define IS_NIGHTLY_BUILD false #define IS_NOT_NIGHTLY_BUILD true #endif #if defined(NIGHTLY_BUILD) || defined(MOZ_DEV_EDITION) #define IS_NIGHTLY_OR_DEV_EDITION true #else #define IS_NIGHTLY_OR_DEV_EDITION false #endif #ifdef MOZILLA_OFFICIAL #define IS_NOT_MOZILLA_OFFICIAL false #else #define IS_NOT_MOZILLA_OFFICIAL true #endif #ifdef EARLY_BETA_OR_EARLIER #define IS_EARLY_BETA_OR_EARLIER true #define IS_NOT_EARLY_BETA_OR_EARLIER false #else #define IS_EARLY_BETA_OR_EARLIER false #define IS_NOT_EARLY_BETA_OR_EARLIER true #endif #if defined(MOZ_DEV_EDITION) || defined(EARLY_BETA_OR_EARLIER) #define IS_DEV_EDITION_OR_EARLY_BETA_OR_EARLIER true #else #define IS_DEV_EDITION_OR_EARLY_BETA_OR_EARLIER false #endif #ifdef ANDROID #define IS_ANDROID true #define IS_NOT_ANDROID false #else #define IS_ANDROID false #define IS_NOT_ANDROID true #endif #ifdef XP_WIN #define IS_XP_WIN true #define IS_NOT_XP_WIN false #else #define IS_XP_WIN false #define IS_NOT_XP_WIN true #endif #ifdef XP_MACOSX #define IS_XP_MACOSX true #define IS_NOT_XP_MACOSX false #else #define IS_XP_MACOSX false #define IS_NOT_XP_MACOSX true #endif #--------------------------------------------------------------------------- # Prefs starting with "accessibility." #--------------------------------------------------------------------------- # Tab focus model bit field: # 1 focuses text controls, 2 focuses other form elements, 4 adds links. # Most users will want 1, 3, or 7. On macOS we expose a checkbox to alter # between 7 and 3. - name: accessibility.tabfocus type: int32_t value: 7 mirror: always # Only on mac tabfocus is expected to handle UI widgets as well as web content. # FIXME(emilio): This is weird now that we have a lot of HTML in our pages. - name: accessibility.tabfocus_applies_to_xul type: bool value: @IS_XP_MACOSX@ mirror: always - name: accessibility.accesskeycausesactivation type: bool value: true mirror: always - name: accessibility.monoaudio.enable type: RelaxedAtomicBool value: false mirror: always - name: accessibility.browsewithcaret type: RelaxedAtomicBool value: false mirror: always - name: accessibility.AOM.enabled type: bool value: false mirror: always - name: accessibility.ARIAElementReflection.enabled type: bool value: @IS_NIGHTLY_BUILD@ mirror: always # Whether to enable all accessibility cache domains on startup. # * false: enable domains as needed # * true: enable all domains regardless of need (cache everything) - name: accessibility.enable_all_cache_domains type: bool value: false mirror: once # Whether form controls and images should be focusable with mouse, in content # documents. # # This matches historical macOS / Safari behavior. # # * 0: never # * 1: always # * 2: on content documents - name: accessibility.mouse_focuses_formcontrol type: int32_t #ifdef XP_MACOSX value: 2 #else value: 1 #endif mirror: always # Whether to enable support for the UI Automation API on Windows. - name: accessibility.uia.enable type: bool value: false mirror: always # Whether to avoid accessibility activation on Windows shortly after clipboard # copy. # # Possible values are: # * 0: never # * 1: always # * 2 (or others): when needed - name: accessibility.windows.suppress-after-clipboard-copy type: uint32_t value: 2 mirror: always # Whether to avoid accessibility activation on Windows shortly after max button # hit-test for the "snap layout" feature. # # Possible values are: # * 0: never # * 1: always # * 2 (or others): when needed - name: accessibility.windows.suppress-for-snap-layout type: uint32_t value: 2 mirror: always #--------------------------------------------------------------------------- # Prefs starting with "alerts." #--------------------------------------------------------------------------- # Whether to use platform-specific backends for showing desktop notifications. # If no such backend is available, or if the pref is false, then XUL # notifications are used. - name: alerts.useSystemBackend type: bool value: true mirror: always #if defined(XP_WIN) # On Windows, a COM Surrogate notification server receives notification events # and can relaunch the application after it has been closed. - name: alerts.useSystemBackend.windows.notificationserver.enabled type: bool value: true mirror: never #endif #ifdef ANDROID #--------------------------------------------------------------------------- # Prefs starting with "android." #--------------------------------------------------------------------------- # On Android, we want an opaque background to be visible under the page, # so layout should not force a default background. - name: android.widget_paints_background type: RelaxedAtomicBool value: true mirror: always - name: android.touch_resampling.enabled type: RelaxedAtomicBool value: false mirror: always #endif #--------------------------------------------------------------------------- # Prefs starting with "apz." # The apz prefs are explained in AsyncPanZoomController.cpp #--------------------------------------------------------------------------- # amount we zoom in for a double tap gesture if we couldn't find any content # based rect to zoom to - name: apz.doubletapzoom.defaultzoomin type: AtomicFloat value: 1.2f mirror: always - name: apz.scrollbarbuttonrepeat.enabled type: RelaxedAtomicBool value: true mirror: always # After a user has executed a pan gesture, we may receive momentum phase pan # gestures from the OS. This specifies how long we should wait following the # pan end gesture for possible momentum phase pan gestures before sending the # TransformEnd notification. - name: apz.scrollend-event.content.delay_ms type: RelaxedAtomicInt32 value: 100 mirror: always - name: apz.wr.activate_all_scroll_frames type: RelaxedAtomicBool value: false mirror: always - name: apz.wr.activate_all_scroll_frames_when_fission type: RelaxedAtomicBool value: true mirror: always - name: apz.prefer_jank_minimal_displayports type: RelaxedAtomicBool value: true mirror: always - name: apz.allow_double_tap_zooming type: RelaxedAtomicBool value: true mirror: always - name: apz.mac.enable_double_tap_zoom_touchpad_gesture type: RelaxedAtomicBool value: true mirror: always - name: apz.allow_immediate_handoff type: RelaxedAtomicBool value: false mirror: always - name: apz.allow_zooming type: RelaxedAtomicBool value: true mirror: always - name: apz.max_zoom type: AtomicFloat value: 10.0f mirror: always - name: apz.min_zoom type: AtomicFloat value: 0.25f mirror: always - name: apz.allow_zooming_out type: RelaxedAtomicBool value: false mirror: always - name: apz.android.chrome_fling_physics.friction type: AtomicFloat value: 0.015f mirror: always - name: apz.android.chrome_fling_physics.inflexion type: AtomicFloat value: 0.35f mirror: always - name: apz.android.chrome_fling_physics.stop_threshold type: AtomicFloat value: 0.1f mirror: always - name: apz.autoscroll.enabled type: RelaxedAtomicBool value: true mirror: always - name: apz.axis_lock.breakout_angle type: AtomicFloat value: float(M_PI / 8.0) # 22.5 degrees mirror: always include: - name: apz.axis_lock.breakout_threshold type: AtomicFloat value: 1.0f / 32.0f mirror: always - name: apz.axis_lock.direct_pan_angle type: AtomicFloat value: float(M_PI / 3.0) # 60 degrees mirror: always include: - name: apz.axis_lock.lock_angle type: AtomicFloat value: float(M_PI / 6.0) # 30 degrees mirror: always include: # Whether to lock touch scrolling to one axis at a time. When a new # axis lock mode is added, the APZCAxisLockCompatTester GTest shoud # be updated to include the lock mode value. # 0 = FREE (No locking at all) # 1 = STANDARD (Once locked, remain locked until scrolling ends) # 2 = STICKY (Allow lock to be broken, with hysteresis) # 3 = DOMINANT_AXIS (Only allow movement on one axis at a time, only # applies to touchpad scrolling) - name: apz.axis_lock.mode type: RelaxedAtomicInt32 #if defined(XP_MACOSX) value: 3 #else value: 2 #endif mirror: always - name: apz.content_response_timeout type: RelaxedAtomicInt32 value: 400 mirror: always - name: apz.danger_zone_x type: RelaxedAtomicInt32 value: 50 mirror: always - name: apz.danger_zone_y type: RelaxedAtomicInt32 value: 100 mirror: always - name: apz.disable_for_scroll_linked_effects type: RelaxedAtomicBool value: false mirror: always - name: apz.displayport_expiry_ms type: RelaxedAtomicUint32 value: 15000 mirror: always - name: apz.drag.enabled type: RelaxedAtomicBool value: true mirror: always - name: apz.drag.touch.enabled type: RelaxedAtomicBool value: true mirror: always - name: apz.enlarge_displayport_when_clipped type: RelaxedAtomicBool value: @IS_ANDROID@ mirror: always # Test only. - name: apz.fixed-margin-override.enabled type: RelaxedAtomicBool value: false mirror: always # Test only. - name: apz.fixed-margin-override.bottom type: RelaxedAtomicInt32 value: 0 mirror: always # Test only. - name: apz.fixed-margin-override.top type: RelaxedAtomicInt32 value: 0 mirror: always - name: apz.fling_accel_base_mult type: AtomicFloat value: 1.0f mirror: always - name: apz.fling_accel_supplemental_mult type: AtomicFloat value: 1.0f mirror: always - name: apz.fling_accel_min_fling_velocity type: AtomicFloat value: 1.5f mirror: always - name: apz.fling_accel_min_pan_velocity type: AtomicFloat value: 0.8f mirror: always - name: apz.fling_accel_max_pause_interval_ms type: RelaxedAtomicInt32 value: 50 mirror: always - name: apz.fling_curve_function_x1 type: float value: 0.0f mirror: once - name: apz.fling_curve_function_x2 type: float value: 1.0f mirror: once - name: apz.fling_curve_function_y1 type: float value: 0.0f mirror: once - name: apz.fling_curve_function_y2 type: float value: 1.0f mirror: once - name: apz.fling_curve_threshold_inches_per_ms type: AtomicFloat value: -1.0f mirror: always - name: apz.fling_friction type: AtomicFloat value: 0.002f mirror: always - name: apz.fling_min_velocity_threshold type: AtomicFloat value: 0.5f mirror: always - name: apz.fling_stop_on_tap_threshold type: AtomicFloat value: 0.05f mirror: always - name: apz.fling_stopped_threshold type: AtomicFloat value: 0.01f mirror: always - name: apz.touch_acceleration_factor_x type: float value: 1.0f mirror: always - name: apz.touch_acceleration_factor_y type: float value: 1.0f mirror: always #ifdef MOZ_WIDGET_GTK - name: apz.gtk.kinetic_scroll.enabled type: RelaxedAtomicBool value: true mirror: always - name: apz.gtk.pangesture.enabled type: RelaxedAtomicBool value: true mirror: always # Mode to use when receiving pan gesture input. # # * 0: Auto mode (uses the default behavior, subject to change). # * 1: Page mode: Uses gtk deltas as a percentage of the page size to scroll. This mode matches: # # https://gitlab.gnome.org/GNOME/gtk/blob/c734c7e9188b56f56c3a504abee05fa40c5475ac/gtk/gtkrange.c#L3063-3074 # # * 2: Pixel mode: Uses gtk deltas as a fixed pixel multiplier. This mode matches e.g. GNOME web. # # https://webkit-search.igalia.com/webkit/rev/215039ef09d6bfd6e088175bfe30788d95b9705d/Source/WebKit/Shared/gtk/WebEventFactory.cpp#265-296 # (multiplied then by pixelsPerLineStep which in GNOME-web is 40). - name: apz.gtk.pangesture.delta_mode type: uint32_t value: 0 mirror: always - name: apz.gtk.pangesture.page_delta_mode_multiplier type: float value: 1.0f mirror: always - name: apz.gtk.pangesture.pixel_delta_mode_multiplier type: float value: 40.0f mirror: always - name: apz.gtk.touchpad_pinch.enabled type: RelaxedAtomicBool value: true mirror: always - name: apz.gtk.touchpad_pinch.three_fingers.enabled type: RelaxedAtomicBool value: false mirror: always - name: apz.gtk.touchpad_hold.enabled type: RelaxedAtomicBool value: true mirror: always #endif - name: apz.keyboard.enabled type: bool value: @IS_NOT_ANDROID@ mirror: once - name: apz.keyboard.passive-listeners type: RelaxedAtomicBool value: @IS_NOT_ANDROID@ mirror: always - name: apz.max_tap_time type: RelaxedAtomicInt32 value: 300 mirror: always - name: apz.max_velocity_inches_per_ms type: AtomicFloat value: -1.0f mirror: always - name: apz.max_velocity_queue_size type: uint32_t value: 5 mirror: once - name: apz.min_skate_speed type: AtomicFloat value: 1.0f mirror: always - name: apz.minimap.enabled type: RelaxedAtomicBool value: false mirror: always - name: apz.one_touch_pinch.enabled type: RelaxedAtomicBool value: @IS_ANDROID@ mirror: always - name: apz.overscroll.enabled type: RelaxedAtomicBool value: true mirror: always # The "test async scroll offset" (used via reftest-async-scroll # or nsIDOMWindowUtils.setAsyncScrollOffset()) can be used to # trigger overscroll. Used for tests only. - name: apz.overscroll.test_async_scroll_offset.enabled type: RelaxedAtomicBool value: false mirror: always - name: apz.overscroll.min_pan_distance_ratio type: AtomicFloat value: 1.0f mirror: always - name: apz.overscroll.stop_distance_threshold type: AtomicFloat value: 5.0f mirror: always - name: apz.overscroll.spring_stiffness type: AtomicFloat value: 200 mirror: always - name: apz.overscroll.damping type: AtomicFloat value: 1.1 mirror: always - name: apz.overscroll.max_velocity type: AtomicFloat value: 10 mirror: always - name: apz.paint_skipping.enabled type: RelaxedAtomicBool value: true mirror: always # Fetch displayport updates early from the message queue. - name: apz.pinch_lock.mode type: RelaxedAtomicInt32 value: 2 mirror: always - name: apz.pinch_lock.scroll_lock_threshold type: AtomicFloat value: 1.0f / 16.0f # 1/16 inches mirror: always - name: apz.pinch_lock.span_breakout_threshold type: AtomicFloat value: 1.0f / 32.0f # 1/32 inches mirror: always - name: apz.pinch_lock.span_lock_threshold type: AtomicFloat value: 1.0f / 32.0f # 1/32 inches mirror: always - name: apz.pinch_lock.buffer_max_age type: int32_t value: 80 # milliseconds mirror: once - name: apz.popups.enabled type: RelaxedAtomicBool value: true mirror: always # Whether to print the APZC tree for debugging. - name: apz.printtree type: RelaxedAtomicBool value: false mirror: always - name: apz.record_checkerboarding type: RelaxedAtomicBool value: @IS_NIGHTLY_BUILD@ mirror: always - name: apz.second_tap_tolerance type: AtomicFloat value: 0.5f mirror: always # If this is true, APZ fully recalculates the scroll thumb size and # position in the compositor. This leads to the size and position # being more accurate in scenarios such as async zooming. - name: apz.scrollthumb.recalc type: RelaxedAtomicBool value: true mirror: always - name: apz.test.fails_with_native_injection type: RelaxedAtomicBool value: false mirror: always - name: apz.test.logging_enabled type: RelaxedAtomicBool value: false mirror: always - name: apz.touch_move_tolerance type: AtomicFloat value: 0.1f mirror: always - name: apz.touch_scroll.buffer_max_age type: int32_t value: 200 # milliseconds mirror: once - name: apz.touch_start_tolerance type: AtomicFloat value: 0.1f mirror: always - name: apz.velocity_bias type: AtomicFloat value: 0.0f mirror: always - name: apz.velocity_relevance_time_ms type: RelaxedAtomicUint32 value: 100 mirror: always - name: apz.windows.force_disable_direct_manipulation type: RelaxedAtomicBool value: false mirror: always - name: apz.windows.use_direct_manipulation type: RelaxedAtomicBool value: true mirror: always - name: apz.windows.check_for_pan_gesture_conversion type: RelaxedAtomicBool value: true mirror: always - name: apz.x_skate_highmem_adjust type: AtomicFloat value: 0.0f mirror: always - name: apz.x_skate_size_multiplier type: AtomicFloat value: 1.25f mirror: always - name: apz.x_stationary_size_multiplier type: AtomicFloat value: 1.5f mirror: always - name: apz.y_skate_highmem_adjust type: AtomicFloat value: 0.0f mirror: always - name: apz.y_skate_size_multiplier type: AtomicFloat #if defined(MOZ_WIDGET_ANDROID) value: 1.5f #else value: 3.5f #endif mirror: always - name: apz.y_stationary_size_multiplier type: AtomicFloat #if defined(MOZ_WIDGET_ANDROID) value: 1.5f #else value: 3.5f #endif mirror: always - name: apz.zoom_animation_duration_ms type: RelaxedAtomicInt32 #if defined(MOZ_WIDGET_ANDROID) value: 250 #else value: 350 #endif mirror: always - name: apz.scale_repaint_delay_ms type: RelaxedAtomicInt32 value: 500 mirror: always # Whether to use rounded external scroll offsets. - name: apz.rounded_external_scroll_offset type: bool value: false mirror: always #--------------------------------------------------------------------------- # Prefs starting with "beacon." #--------------------------------------------------------------------------- # Is support for Navigator.sendBeacon enabled? - name: beacon.enabled type: bool value: true mirror: always #--------------------------------------------------------------------------- # Prefs starting with "bidi." #--------------------------------------------------------------------------- # Whether delete and backspace should immediately delete characters not # visually adjacent to the caret, or adjust the visual position of the caret # on the first keypress and delete the character on a second keypress - name: bidi.edit.delete_immediately type: bool value: true mirror: always # Bidi caret movement style: # 0 = logical # 1 = visual # 2 = visual, but logical during selection - name: bidi.edit.caret_movement_style type: int32_t #if !defined(XP_LINUX) && defined(NIGHTLY_BUILD) value: 1 #else value: 2 # See Bug 1638240 #endif mirror: always # Bidi numeral style: # 0 = nominalnumeralBidi * # 1 = regularcontextnumeralBidi # 2 = hindicontextnumeralBidi # 3 = arabicnumeralBidi # 4 = hindinumeralBidi # 5 = persiancontextnumeralBidi # 6 = persiannumeralBidi - name: bidi.numeral type: RelaxedAtomicUint32 value: 0 mirror: always # Bidi text type # 1 = charsettexttypeBidi * # 2 = logicaltexttypeBidi # 3 = visualtexttypeBidi - name: bidi.texttype type: RelaxedAtomicUint32 value: 1 mirror: always # Bidi direction # 1 = directionLTRBidi * # 2 = directionRTLBidi - name: bidi.direction type: RelaxedAtomicUint32 value: 1 mirror: always # Setting this pref to |true| forces Bidi UI menu items and keyboard shortcuts # to be exposed, and enables the directional caret hook. By default, only # expose it for bidi-associated system locales. - name: bidi.browser.ui type: bool value: false mirror: always #--------------------------------------------------------------------------- # Prefs starting with "browser." #--------------------------------------------------------------------------- - name: browser.active_color type: String value: "#EE0000" mirror: never - name: browser.active_color.dark type: String value: "#FF6666" mirror: never - name: browser.anchor_color type: String value: "#0000EE" mirror: never # If you change this, you probably also want to change # nsXPLookAndFeel::GenericDarkColor for MozNativehyperlinktext. - name: browser.anchor_color.dark type: String value: "#8C8CFF" mirror: never # See http://dev.w3.org/html5/spec/forms.html#attr-fe-autofocus - name: browser.autofocus type: bool value: true mirror: always - name: browser.cache.disk.enable type: RelaxedAtomicBool value: true mirror: always - name: browser.cache.memory.enable type: RelaxedAtomicBool value: true mirror: always # Limit of recent metadata we keep in memory for faster access, in KB. - name: browser.cache.disk.metadata_memory_limit type: RelaxedAtomicUint32 value: 250 # 0.25 MB mirror: always # Does the user want smart-sizing? - name: browser.cache.disk.smart_size.enabled type: RelaxedAtomicBool value: true mirror: always # Disk cache capacity in kilobytes. It's used only when # browser.cache.disk.smart_size.enabled == false - name: browser.cache.disk.capacity type: RelaxedAtomicUint32 value: 256000 mirror: always # -1 = determine dynamically, 0 = none, n = memory capacity in kilobytes. - name: browser.cache.memory.capacity type: RelaxedAtomicInt32 value: -1 mirror: always # When smartsizing is disabled we could potentially fill all disk space by # cache data when the disk capacity is not set correctly. To avoid that we # check the free space every time we write some data to the cache. The free # space is checked against two limits. Once the soft limit is reached we start # evicting the least useful entries, when we reach the hard limit writing to # the entry fails. - name: browser.cache.disk.free_space_soft_limit type: RelaxedAtomicUint32 value: 5 * 1024 # 5MB mirror: always - name: browser.cache.disk.free_space_hard_limit type: RelaxedAtomicUint32 value: 1024 # 1MB mirror: always # The number of chunks we preload ahead of read. One chunk currently has # 256kB. - name: browser.cache.disk.preload_chunk_count type: RelaxedAtomicUint32 value: 4 # 1 MB of read ahead mirror: always # Max-size (in KB) for entries in disk cache. Set to -1 for no limit. # (Note: entries bigger than 1/8 of disk-cache are never cached) - name: browser.cache.disk.max_entry_size type: RelaxedAtomicUint32 value: 50 * 1024 # 50 MB mirror: always # Max-size (in KB) for entries in memory cache. Set to -1 for no limit. # (Note: entries bigger than than 90% of the mem-cache are never cached.) - name: browser.cache.memory.max_entry_size type: RelaxedAtomicInt32 value: 5 * 1024 mirror: always # Memory limit (in kB) for new cache data not yet written to disk. Writes to # the cache are buffered and written to disk on background with low priority. # With a slow persistent storage these buffers may grow when data is coming # fast from the network. When the amount of unwritten data is exceeded, new # writes will simply fail. We have two buckets, one for important data # (priority) like html, css, fonts and js, and one for other data like images, # video, etc. # Note: 0 means no limit. - name: browser.cache.disk.max_chunks_memory_usage type: RelaxedAtomicUint32 value: 40 * 1024 mirror: always - name: browser.cache.disk.max_priority_chunks_memory_usage type: RelaxedAtomicUint32 value: 40 * 1024 mirror: always # Number of seconds the cache spends writing pending data and closing files # after shutdown has been signalled. Past that time data is not written and # files are left open for the OS to clean up. - name: browser.cache.max_shutdown_io_lag type: RelaxedAtomicUint32 value: 2 mirror: always # After the max_shutdown_io_lag has passed, we will attempt to cancel # blocking IO (on windows). The CacheIOThread may pick up more blocking # tasks so we want to cancel those too. The main thread will be woken # up every shutdown_io_time_between_cancellations_ms to cancel the IO # on the other thread. - name: browser.cache.shutdown_io_time_between_cancellations_ms type: RelaxedAtomicUint32 value: 5 mirror: always # A percentage limit for media content type in the disk cache. When some entries # need to be evicted and media is over the limit, it's evicted first. - name: browser.cache.disk.content_type_media_limit type: RelaxedAtomicInt32 value: 50 mirror: always # How often to validate document in cache # 0 = once-per-session, # 1 = each-time, # 2 = never, # 3 = when-appropriate/automatically - name: browser.cache.check_doc_frequency type: RelaxedAtomicUint32 value: 3 mirror: always # Compression level for cached JavaScript bytecode # 0 = do not compress, # 1 = minimal compression, # 9 = maximal compression - name: browser.cache.jsbc_compression_level type: RelaxedAtomicUint32 value: 0 mirror: always # Whether tooltips are enabled. - name: browser.chrome.toolbar_tips type: bool value: true mirror: always # Whether tooltips are hidden on keydown. # 0: never # 1: always # 2: only on non-modifier keys - name: browser.chrome.toolbar_tips.hide_on_keydown type: uint32_t #if defined(XP_WIN) value: 0 #else value: 2 #endif mirror: always # DLP agent name, for display in the browser - name: browser.contentanalysis.agent_name type: String value: "A DLP agent" mirror: never # (optional) The organization name that the DLP agent should have. If this is # non-empty and the DLP agent is not signed with this organization name, # Firefox will fail the connection. - name: browser.contentanalysis.client_signature type: String value: "" mirror: never # Content analysis by external applications, e.g. data-loss prevention apps - name: browser.contentanalysis.enabled type: bool value: false mirror: always # What content analysis should return if there is a problem communicating # with the agent. (see DefaultResponse enum in ContentAnalysis.h) # Make sure these stay in sync with the out-of-range check in Policies.sys.mjs. # # 0: Block all requests # 1: Warn on all requests (which lets the user decide) # 2: Allow all requests - name: browser.contentanalysis.default_result type: uint32_t value: 0 mirror: always # Is the IPC pipe to the DLP tool specific to the user or to the system? - name: browser.contentanalysis.is_per_user type: bool value: true mirror: always # Path name of pipe used to connect to a configured DLP agent. - name: browser.contentanalysis.pipe_path_name type: String value: "path_user" mirror: never # Space-separated list of regexs that are compared to URLs of resources # being checked by content-analysis. Resources that match are not checked # and are always permitted. # By default this does not check any about: page except for about:blank # and about:srcdoc. - name: browser.contentanalysis.allow_url_regex_list type: String value: "^about:(?!blank|srcdoc).*" mirror: never # Space-separated list of regexs that are compared to URLs of resources # being checked by content-analysis. Resources that match are not checked # and are always denied. - name: browser.contentanalysis.deny_url_regex_list type: String value: "" mirror: never # Should CA ignore the system setting and use silent notifications? - name: browser.contentanalysis.silent_notifications type: bool value: false mirror: always # Time (secs) after which content analysis operations are considered timed-out - name: browser.contentanalysis.agent_timeout type: uint32_t value: 30 mirror: always # Should Firefox show a notification or dialog when content analysis blocks # access? - name: browser.contentanalysis.show_blocked_result type: bool value: true mirror: always # Should Firefox bypass content analysis for pastes and drags whose source # is the same tab? - name: browser.contentanalysis.bypass_for_same_tab_operations type: bool value: false mirror: always # Should Firefox use content analysis for clipboard operations? # Note that this has no effect unless browser.contentanalysis.enabled # is true. - name: browser.contentanalysis.interception_point.clipboard.enabled type: bool value: true mirror: always # Should Firefox use content analysis for drag and drop operations? # Note that this has no effect unless browser.contentanalysis.enabled # is true. - name: browser.contentanalysis.interception_point.drag_and_drop.enabled type: bool value: true mirror: always # Should Firefox use content analysis for file upload operations through # a file dialog? # Note that this has no effect unless browser.contentanalysis.enabled # is true. - name: browser.contentanalysis.interception_point.file_upload.enabled type: bool value: true mirror: always # Should Firefox use content analysis for print operations? # Note that this has no effect unless browser.contentanalysis.enabled # is true. - name: browser.contentanalysis.interception_point.print.enabled type: bool value: true mirror: always # Content blocking for Enhanced Tracking Protection - name: browser.contentblocking.database.enabled type: bool value: false mirror: always # How many recent block/unblock actions per origins we remember in the # Content Blocking log for each top-level window. - name: browser.contentblocking.originlog.length type: uint32_t value: 32 mirror: always # Min font device pixel size at which to turn on high quality. - name: browser.display.auto_quality_min_font_size type: RelaxedAtomicUint32 value: 20 mirror: always - name: browser.display.background_color type: String value: "#FFFFFF" mirror: never - name: browser.display.background_color.dark type: String value: "#1C1B22" mirror: never # This preference is a bit confusing because we use the opposite # string value in the colors dialog to indicate to users how FF HCM # will behave. # With resect to document colors, these values mean: # 0 = "default" = always, except in high contrast mode # 1 = "always" # 2 = "never" # # On windows, we set this to 0, which means FF HCM will mirror OS HCM. # Everywhere else, we set this to 1, disabling FF HCM. - name: browser.display.document_color_use type: RelaxedAtomicUint32 #if defined(XP_WIN) value: 0 #else value: 1 #endif mirror: always rust: true # 0 = always native # 1 = never native # other = default - name: browser.display.windows.non_native_menus type: RelaxedAtomicUint32 value: 2 mirror: always rust: true # This pref dictates whether or not backplates and background images # are to be drawn, when in high-contrast mode: # false: do not draw backplates or render background images # true: render background images and draw backplates # This condition is only considered when high-contrast mode is enabled # in Firefox, ie. when the user has: # (1) mUseAccessibilityMode set to true (Widows high-contrast mode is on) # AND browser.display.document_color_use set to 0 # (only with high-contrast themes) OR # (2) browser.display.document_color_use set to 2 (always) - name: browser.display.permit_backplate type: RelaxedAtomicBool value: true mirror: always rust: true # Whether we should suppress the background-image of the canvas (the root # frame) if we're in forced colors mode. # # This is important because some sites use background-image with a plain color # and it causes undesirable results in high-contrast mode. # # See bug 1614921 for example. - name: browser.display.suppress_canvas_background_image_on_forced_colors type: bool value: true mirror: always - name: browser.display.foreground_color type: String value: "#000000" mirror: never - name: browser.display.foreground_color.dark type: String value: "#FBFBFE" mirror: never # Determines the behavior of OS zoom settings. # # 0: doesn't affect rendering at all # 1: affects full zoom (dpi, effectively). # 2: affects text zoom. # # Default is (1): Historical behavior on Linux, matches other browsers on # Windows, and generally creates more consistent rendering. - name: browser.display.os-zoom-behavior type: RelaxedAtomicInt32 value: 1 mirror: always rust: true # Whether focus rings are always shown by default. # # This is the initial value of nsWindowRoot::mShowFocusRings, but it can be # overridden by system preferences. - name: browser.display.show_focus_rings type: bool value: false mirror: always # Enable showing image placeholders while image is loading or when image is broken. - name: browser.display.show_image_placeholders type: bool value: true mirror: always # Whether we should always enable focus rings after focus was moved by keyboard. # # This behavior matches both historical and GTK / Windows focus behavior. # # :focus-visible is intended to provide better heuristics than this. - name: browser.display.always_show_rings_after_key_focus type: bool value: false mirror: always # In theory: 0 = never, 1 = quick, 2 = always, though we always just use it as # a bool! - name: browser.display.use_document_fonts type: RelaxedAtomicInt32 value: 1 mirror: always rust: true # font-family names for which we'll override use_document_fonts=0, and always # use the specified font. # This is to support ligature-icon fonts, which render literal strings like # "arrow_drop_down" with an icon, even when use_document_fonts is disabled. # If an author provides & uses such a font, and we decline to use it, we'll end # up rendering these literal strings where the author intended an icon, which # can cause all sorts of overlapping/unreadable content. - name: browser.display.use_document_fonts.icon_font_allowlist type: String value: >- Material Icons, Material Icons Extended, Material Icons Outlined, Material Icons Round, Material Icons Sharp, Material Icons Two Tone, Google Material Icons, Google Material Icons Filled, Material Symbols Outlined, Material Symbols Round, Material Symbols Rounded, Material Symbols Sharp, Google Symbols, FontAwesome mirror: never - name: browser.display.use_system_colors type: RelaxedAtomicBool #ifdef XP_WIN value: true #else value: false #endif mirror: always - name: browser.dom.window.dump.enabled type: RelaxedAtomicBool value: @IS_NOT_MOZILLA_OFFICIAL@ mirror: always # See bug 1738574 - name: browser.download.start_downloads_in_tmp_dir type: bool value: false mirror: always # See bug 1747343 - name: browser.download.always_ask_before_handling_new_types type: bool value: false mirror: always # See bug 1731668 - name: browser.download.enable_spam_prevention type: bool value: false mirror: always # See bug 1772569 - name: browser.download.open_pdf_attachments_inline type: bool value: false mirror: always # See bug 1811830 - name: browser.download.force_save_internally_handled_attachments type: bool value: false mirror: always - name: browser.download.sanitize_non_media_extensions type: bool value: true mirror: always # Image document's automatic image sizing. - name: browser.enable_automatic_image_resizing type: bool value: true mirror: always # Image document's click-to-resize. - name: browser.enable_click_image_resizing type: bool value: @IS_NOT_ANDROID@ mirror: always - name: browser.find.ignore_ruby_annotations type: bool value: true mirror: always #if defined(XP_MACOSX) # Whether pressing Esc will exit fullscreen. - name: browser.fullscreen.exit_on_escape type: bool value: true mirror: always #endif # The max url length we'll store in history. # # The default value is mostly a guess based on various facts: # # * IE didn't support urls longer than 2083 chars # * Sitemaps protocol used to support a maximum of 2048 chars # * Various SEO guides suggest to not go over 2000 chars # * Various apps/services are known to have issues over 2000 chars # * RFC 2616 - HTTP/1.1 suggests being cautious about depending # on URI lengths above 255 bytes # - name: browser.history.maxUrlLength type: uint32_t value: 2000 mirror: always # Max size of push/replaceState data parameter - name: browser.history.maxStateObjectSize type: int32_t value: 16777216 mirror: always # True to collect wireframes upon navigations / pushState - name: browser.history.collectWireframes type: bool value: false mirror: always # The minimum area for a rect to be included in a wireframe, in CSS pixels. # # The current value of 50 is pretty arbitrary, and will be tuned as we refine # and test the wireframing capability. - name: browser.history.wireframeAreaThreshold type: uint32_t value: 50 mirror: always #if defined(XP_WIN) || defined(XP_LINUX) # Notify TabUnloader or send the memory pressure if the memory resource # notification is signaled AND the available commit space is lower than # this value. - name: browser.low_commit_space_threshold_mb type: RelaxedAtomicUint32 value: 200 mirror: always #endif #ifdef XP_LINUX # On Linux we also check available memory in comparison to total memory, # and use this percent value (out of 100) to determine if we are in a # low memory scenario. - name: browser.low_commit_space_threshold_percent type: RelaxedAtomicUint32 value: 5 mirror: always #endif # Render animations and videos as a solid color - name: browser.measurement.render_anims_and_video_solid type: RelaxedAtomicBool value: false mirror: always - name: browser.navigation.requireUserInteraction type: bool value: @IS_EARLY_BETA_OR_EARLIER@ mirror: always # Indicates if about:newtab shows content (enabled) or just blank. - name: browser.newtabpage.enabled type: bool value: true mirror: always # Open PDFs in Edge with the --app flag if it is the default. - name: browser.pdf.launchDefaultEdgeAsApp type: bool value: true mirror: always # Maximium delay between keystrokes that will be considered typing (milliseconds). - name: browser.places.interactions.typing_timeout_ms type: RelaxedAtomicUint32 value: 3000 mirror: always # Maximum delay between scroll input events that will be considered a scrolling interaction (milliseconds). - name: browser.places.interactions.scrolling_timeout_ms type: RelaxedAtomicUint32 value: 5000 mirror: always # Number of seconds till the sponsored session is timeout. - name: browser.places.sponsoredSession.timeoutSecs type: RelaxedAtomicUint32 value: 3600 mirror: always # Whether to start the private browsing mode at application startup - name: browser.privatebrowsing.autostart type: bool value: false mirror: always # Force usage of in-memory (rather than file on disk) media cache for video streaming when private browsing - name: browser.privatebrowsing.forceMediaMemoryCache type: bool value: false mirror: always # Communicates the toolbar color to platform (for e.g., prefers-color-scheme). # # Returns whether the toolbar is dark (0), light (1), or system (2). The # theming code overrides it if appropriate. - name: browser.theme.toolbar-theme type: RelaxedAtomicUint32 value: 2 mirror: always # Communicates the preferred content theme color to platform (for e.g., # prefers-color-scheme). # # dark (0), light (1), system (2), or toolbar (3). # # Default to "toolbar", the theming code sets it appropriately. - name: browser.theme.content-theme type: RelaxedAtomicUint32 value: 2 mirror: always rust: true # Whether the firefox titlebar respects the # -moz-windows-accent-color-in-titlebar setting on the tab strip. - name: browser.theme.windows.accent-color-in-tabs.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # Blocked plugin content - name: browser.safebrowsing.blockedURIs.enabled type: bool value: true mirror: always # Malware protection - name: browser.safebrowsing.malware.enabled type: bool value: true mirror: always # Phishing protection - name: browser.safebrowsing.phishing.enabled type: bool value: true mirror: always # Maximum size for an array to store the safebrowsing prefixset. - name: browser.safebrowsing.prefixset_max_array_size type: RelaxedAtomicUint32 value: 512*1024 mirror: always # SessionStore prefs # Maximum number of bytes of DOMSessionStorage data we collect per origin. - name: browser.sessionstore.dom_storage_limit type: uint32_t value: 2048 mirror: always # Maximum number of characters of form field data per field we collect. - name: browser.sessionstore.dom_form_limit type: uint32_t value: 1024*1024*2 mirror: always # Maximum number of characters of form data we collect per origin. - name: browser.sessionstore.dom_form_max_limit type: uint32_t value: 1024*1024*50 mirror: always # Minimal interval between two save operations in milliseconds (while the user is active). - name: browser.sessionstore.interval type: RelaxedAtomicUint32 value: 15000 mirror: always # Disable collection of data for session store using the native collector code, # instead use the older implementation that's not compatible with session # history in the parent (and thus Fission). - name: browser.sessionstore.disable_platform_collection type: bool #if defined(MOZ_THUNDERBIRD) value: true #else value: false #endif mirror: once do_not_use_directly: true #if defined(NIGHTLY_BUILD) || defined(MOZ_DEV_EDITION) || defined(DEBUG) - name: browser.startup.record type: bool value: false mirror: always #endif # Causes SessionStore to ignore non-final update messages from # browser tabs that were not caused by a flush from the parent. # This is a testing flag and should not be used by end-users. - name: browser.sessionstore.debug.no_auto_updates type: RelaxedAtomicBool value: false mirror: always # If set, when a link is opened to a new tab, do not switch to the new tab. # # This pref is used when the link is opened with "Open Link in New Tab", # middle-click, etc. # # See also browser.tabs.loadDivertedInBackground, which is used when the website # diverts the link into a new tab. - name: browser.tabs.loadInBackground type: bool value: true mirror: always # Whether we should draw the tabs on top of the titlebar. # # no (0), yes (1), or default (2), which is true everywhere except Linux. - name: browser.tabs.inTitlebar type: int32_t value: 2 mirror: always # If set, use DocumentChannel to directly initiate loads entirely # from parent-process BrowsingContexts - name: browser.tabs.documentchannel.parent-controlled type: bool value: false mirror: always # If set, middle clicking on a link opens the link in a new tab. - name: browser.tabs.opentabfor.middleclick type: bool value: true mirror: always # Testing-only pref which makes data: URIs be loaded in a "web" content process # instead of within a process based on the URI's loader. - name: browser.tabs.remote.dataUriInDefaultWebProcess type: bool value: false mirror: always # Testing-only pref to force system-triggered about:blank loads to not change # content processes. This is used for performance tests which load an # about:blank document between navigations for historical reasons to avoid # unnecessary process switches. - name: browser.tabs.remote.systemTriggeredAboutBlankAnywhere type: bool value: false mirror: always # Testing-only pref to cause PBrowser creation for a specific BrowsingContext to # fail, to test the errored codepath. - name: browser.tabs.remote.testOnly.failPBrowserCreation.enabled type: bool value: false mirror: always - name: browser.tabs.remote.force-paint type: bool value: true mirror: always # When this pref is enabled document loads with a mismatched # Cross-Origin-Embedder-Policy header will fail to load - name: browser.tabs.remote.useCrossOriginEmbedderPolicy type: RelaxedAtomicBool value: true mirror: always # This pref makes `credentialless` a valid value for # Cross-Origin-Embedder-Policy header - name: browser.tabs.remote.coep.credentialless type: RelaxedAtomicBool #if defined(ANDROID) value: @IS_NIGHTLY_BUILD@ #else value: true #endif mirror: always do_not_use_directly: true # When this pref is enabled top level loads with a mismatched # Cross-Origin-Opener-Policy header will be loaded in a separate process. - name: browser.tabs.remote.useCrossOriginOpenerPolicy type: RelaxedAtomicBool value: true mirror: always # When this pref is enabled then we use a separate content process for # top-level load of file:// URIs - name: browser.tabs.remote.separateFileUriProcess type: RelaxedAtomicBool #if !defined(ANDROID) value: true #else value: false #endif mirror: always # Pref to control whether we use a separate privileged content process # for certain mozilla webpages (which are listed in the pref # browser.tabs.remote.separatedMozillaDomains). - name: browser.tabs.remote.separatePrivilegedMozillaWebContentProcess type: bool value: false mirror: always # Whether or not process selection for subframes will prefer re-using an # existing content process over creating a new one. Enabling this pref should # reduce the number of processes allocated for non-first-party domains if # dom.ipc.processCount.webIsolated > 1. - name: browser.tabs.remote.subframesPreferUsed type: bool value: true mirror: always # When this pref is enabled, opaque response is only allowed to enter the # content process if it's a response for media (audio, image, video), CSS, or # JavaScript. - name: browser.opaqueResponseBlocking type: RelaxedAtomicBool #if defined(ANDROID) value: false #else value: true #endif mirror: always # When this pref is enabled, the JS validator will be enabled for # ORB. - name: browser.opaqueResponseBlocking.javascriptValidator type: bool value: true mirror: always # This pref controls how filtering of opaque responses for calls to `Window.fetch`. # (and similar) is performed in the parent process. This is intended to make sure # that data that would be filtered in a content process never actually reaches that # content process. # See https://fetch.spec.whatwg.org/#concept-filtered-response-opaque # 0) Don't filter in the parent process at all, and let content processes handle # opaque filtering. Regardless of if ORB is enabled or not. N.B. that if ORB # is enabled opaque responses will be blocked. # 1) If ORB is enabled, in the parent process, filter the responses that ORB allows. # N.B. any responses ORB doesn't allow will not send data to a content process # since they will return a NetworkError. If the request is allowed by ORB, the # internal response will be intact and sent to the content process as is. # 2) If ORB is enabled, in the parent process, filter the responses that ORB blocks, # when they were issued by `Window.fetch` (and similar). # 3) Filter all responses in the parent, regardless of if ORB is enabled or not. # This means that opaque responses coming from `Window.fetch` won't even be # considered for being blocked by ORB. - name: browser.opaqueResponseBlocking.filterFetchResponse type: uint32_t value: 2 mirror: always do_not_use_directly: true # This pref controls how exceptions to opaque response blocking for the media MIME types # `audio/*` and `video/*` are handled. This is because step 8 in the spec that performs # audio or video type pattern matching cannot handle certain MIME types (yet). # See https://whatpr.org/fetch/1442.html#orb-algorithm # 0) No exceptions # 1) Some exceptions, explicitly hard coded in `IsOpaqueSafeListedSpecBreakingMIMEType` # 2) Allow all MIME types beginning with `audio/*` or `video/*`. - name: browser.opaqueResponseBlocking.mediaExceptionsStrategy type: uint32_t value: 1 mirror: always do_not_use_directly: true # When true, zooming will be enabled on all sites, even ones that declare # user-scalable=no or use touch-action to disable pinch gestures. - name: browser.ui.zoom.force-user-scalable type: RelaxedAtomicBool value: false mirror: always - name: browser.viewport.desktopWidth type: RelaxedAtomicInt32 value: 980 mirror: always - name: browser.visited_color type: String value: "#551A8B" mirror: never # If you change this, you probably also want to change # nsXPLookAndFeel::GenericDarkColor for MozNativevisitedhyperlinktext. - name: browser.visited_color.dark type: String value: "#FFADFF" mirror: never # When true, soft reloads (including location.reload()) # will only froce validate the top level document, subresources will # be loaded normally as-if users normally navigated to the page. - name: browser.soft_reload.only_force_validate_top_level_document type: bool value: true mirror: always # Whether or not to save and restore zoom levels on a per-site basis. - name: browser.zoom.siteSpecific type: bool value: @IS_NOT_ANDROID@ mirror: always #--------------------------------------------------------------------------- # Prefs starting with "channelclassifier." #--------------------------------------------------------------------------- - name: channelclassifier.allowlist_example type: bool value: false mirror: always #--------------------------------------------------------------------------- # Prefs starting with "clipboard." #--------------------------------------------------------------------------- # Clipboard behavior. - name: clipboard.autocopy type: bool #if !defined(ANDROID) && !defined(XP_MACOSX) && defined(XP_UNIX) value: true #else value: false #endif mirror: always #ifdef XP_WIN # allow to copy clipboard data to Clipboard History/Cloud # (used on sensitive data in about:logins and Private Browsing) - name: clipboard.copyPrivateDataToClipboardCloudOrHistory type: bool value: false mirror: always # Whether to put a file promise onto the clipboard when copying images on Windows - name: clipboard.imageAsFile.enabled type: bool value: @IS_NOT_EARLY_BETA_OR_EARLIER@ mirror: always #endif #--------------------------------------------------------------------------- # Prefs starting with "consoleservice." #--------------------------------------------------------------------------- #if defined(ANDROID) # Disable sending console to logcat on release builds. - name: consoleservice.logcat type: RelaxedAtomicBool value: @IS_NOT_RELEASE_OR_BETA@ mirror: always #endif #--------------------------------------------------------------------------- # Prefs starting with "content." #--------------------------------------------------------------------------- - name: content.cors.disable type: bool value: false mirror: always # Back off timer notification after count. # -1 means never. - name: content.notify.backoffcount type: int32_t value: -1 mirror: always # Notification interval in microseconds. # The notification interval has a dramatic effect on how long it takes to # initially display content for slow connections. The current value # provides good incremental display of content without causing an increase # in page load time. If this value is set below 1/10 of a second it starts # to impact page load performance. # See bugzilla bug 72138 for more info. - name: content.notify.interval type: int32_t value: 120000 mirror: always # Do we notify based on time? - name: content.notify.ontimer type: bool value: true mirror: always # How many times to deflect in interactive mode. - name: content.sink.interactive_deflect_count type: int32_t value: 0 mirror: always # How many times to deflect in perf mode. - name: content.sink.perf_deflect_count type: int32_t value: 200 mirror: always # Parse mode for handling pending events. # 0 = don't check for pending events # 1 = don't deflect if there are pending events # 2 = bail if there are pending events - name: content.sink.pending_event_mode type: int32_t #ifdef XP_WIN value: 1 #else value: 0 #endif mirror: always # How often to probe for pending events. 1 = every token. - name: content.sink.event_probe_rate type: int32_t value: 1 mirror: always # How long to stay off the event loop in interactive mode (microseconds). - name: content.sink.interactive_parse_time type: int32_t value: 3000 mirror: always # How long to stay off the event loop in perf mode. - name: content.sink.perf_parse_time type: int32_t value: 30000 mirror: always # How long to be in interactive mode after an event. - name: content.sink.interactive_time type: uint32_t value: 750000 mirror: always # How long to stay in perf mode after initial loading. - name: content.sink.initial_perf_time type: uint32_t value: 2000000 mirror: always # Should we switch between perf-mode and interactive-mode? # 0 = Switch # 1 = Interactive mode # 2 = Perf mode - name: content.sink.enable_perf_mode type: int32_t value: 0 mirror: always #--------------------------------------------------------------------------- # Prefs starting with "converter." #--------------------------------------------------------------------------- # Whether we include ruby annotation in the text despite whether it # is requested. This was true because we didn't explicitly strip out # annotations. Set false by default to provide a better behavior, but # we want to be able to pref-off it if user doesn't like it. - name: converter.html2txt.always_include_ruby type: bool value: false mirror: always #--------------------------------------------------------------------------- # Prefs starting with "cookiebanners." #--------------------------------------------------------------------------- # Controls the cookie banner handling mode in normal browsing. # 0: Disables all cookie banner handling. # 1: Reject-all if possible, otherwise do nothing. # 2: Reject-all if possible, otherwise accept-all. - name: cookiebanners.service.mode type: uint32_t value: 0 mirror: always # When set to true, cookie banners are detected and detection events are # dispatched, but they will not be handled. Requires the service to be enabled # for the desired mode via pref cookiebanners.service.mode* - name: cookiebanners.service.detectOnly type: bool value: false mirror: always # Controls the cookie banner handling mode in private browsing. Same mode # options as the normal browsing pref above. - name: cookiebanners.service.mode.privateBrowsing type: uint32_t value: 0 mirror: always # Enables use of global CookieBannerRules, which apply to all sites. This is # used for click rules that can handle common Consent Management Providers # (CMP). # Enabling this (when the cookie handling feature is enabled) may negatively # impact site performance since it requires us to run rule-defined query # selectors for every page. - name: cookiebanners.service.enableGlobalRules type: bool value: true mirror: always # Whether global rules are allowed to run in sub-frames. Running query selectors # in every sub-frame may negatively impact performance, but is required for some # CMPs. - name: cookiebanners.service.enableGlobalRules.subFrames type: bool value: true mirror: always # Enables the cookie banner cookie injector. The cookie banner cookie injector # depends on the `cookiebanners.service.mode` pref above. - name: cookiebanners.cookieInjector.enabled type: bool value: true mirror: always # By default, how many seconds in the future cookies should expire after they # have been injected. Defaults to 12 months. Individual cookie rules may # override this. - name: cookiebanners.cookieInjector.defaultExpiryRelative type: uint32_t value: 31536000 mirror: always # How many times per site and site load to check for cookie banners after which # the mechanism is considered on cooldown for the site in the current browsing # session. If the threshold is set to zero, banner clicking won't be considered # as being on cooldown regardless of how many times the site is loaded. The # maximum value for the retry is 255, any value over than that will be capped. - name: cookiebanners.bannerClicking.maxTriesPerSiteAndSession type: uint32_t value: 3 mirror: always #--------------------------------------------------------------------------- # Prefs starting with "datareporting." #--------------------------------------------------------------------------- - name: datareporting.healthreport.uploadEnabled type: RelaxedAtomicBool value: false mirror: always rust: true #--------------------------------------------------------------------------- # Prefs starting with "device." #--------------------------------------------------------------------------- # Is support for the device sensors API enabled? - name: device.sensors.enabled type: bool value: true mirror: always # KaiOS-only, see https://bugzilla.mozilla.org/show_bug.cgi?id=1699707#c10 - name: device.sensors.ambientLight.enabled type: bool value: false mirror: always - name: device.sensors.motion.enabled type: bool value: true mirror: always - name: device.sensors.orientation.enabled type: bool value: true mirror: always # KaiOS-only, see https://bugzilla.mozilla.org/show_bug.cgi?id=1699707#c10 - name: device.sensors.proximity.enabled type: bool value: false mirror: always - name: device.sensors.test.events type: bool value: false mirror: always #--------------------------------------------------------------------------- # Prefs starting with "devtools." #--------------------------------------------------------------------------- - name: devtools.console.stdout.chrome type: RelaxedAtomicBool value: @IS_NOT_MOZILLA_OFFICIAL@ mirror: always - name: devtools.console.stdout.content type: RelaxedAtomicBool value: false mirror: always #--------------------------------------------------------------------------- # Prefs starting with "docshell." #--------------------------------------------------------------------------- # Used to indicate whether session history listeners should be notified # about content viewer eviction. Used only for testing. - name: docshell.shistory.testing.bfevict type: bool value: false mirror: always # If true, pages with an opener won't be bfcached. - name: docshell.shistory.bfcache.require_no_opener type: bool value: @IS_ANDROID@ mirror: always # If true, page with beforeunload or unload event listeners can be bfcached. - name: docshell.shistory.bfcache.allow_unload_listeners type: bool value: @IS_ANDROID@ mirror: always # If true, page with beforeunload event listeners can be bfcached. # This only works when sessionHistoryInParent is enabled. - name: docshell.shistory.bfcache.ship_allow_beforeunload_listeners type: bool value: true mirror: always #--------------------------------------------------------------------------- # Prefs starting with "dom." #--------------------------------------------------------------------------- # Allow cut/copy - name: dom.allow_cut_copy type: bool value: true mirror: always # Checks if offscreen animation throttling is enabled. - name: dom.animations.offscreen-throttling type: bool value: true mirror: always # Is support for Navigator.getBattery enabled? - name: dom.battery.enabled type: bool value: true mirror: always # Block multiple external protocol URLs in iframes per single event. - name: dom.block_external_protocol_in_iframes type: bool value: true mirror: always # Block sandboxed BrowsingContexts from navigating to external protocols. - name: dom.block_external_protocol_navigation_from_sandbox type: bool value: true mirror: always # Block Insecure downloads from Secure Origins - name: dom.block_download_insecure type: bool value: true mirror: always # The maximum number of popup that is allowed to be opened. Set to -1 for no # limit. - name: dom.popup_maximum type: int32_t value: -1 mirror: always # Enable experimental popup blocker changes. - name: dom.popup.experimental type: bool value: true mirror: always # Enable CacheAPI in private browsing mode with encryption - name: dom.cache.privateBrowsing.enabled type: RelaxedAtomicBool value: true mirror: always # Exposes window.caches and skips SecureContext check. # dom.serviceWorkers.testing.enabled also includes the same effect. - name: dom.caches.testing.enabled type: RelaxedAtomicBool value: false mirror: always # A pref that is used to slow down database initialization for testing purposes. - name: dom.cache.databaseInitialization.pauseOnIOThreadMs type: RelaxedAtomicUint32 value: 0 mirror: always # Disable capture attribute for input elements; only supported on GeckoView. - name: dom.capture.enabled type: bool value: false mirror: always # HTML specification says the level should be 5 # https://html.spec.whatwg.org/#timer-initialisation-steps - name: dom.clamp.timeout.nesting.level type: uint32_t value: 5 mirror: once # Skip the security checks for document.cookie. - name: dom.cookie.testing.enabled type: RelaxedAtomicBool value: false mirror: always # https://whatpr.org/html/10168/interaction.html#closewatcher - name: dom.closewatcher.enabled type: bool value: false mirror: always # Disable custom highlight API; implementation pending. - name: dom.customHighlightAPI.enabled type: RelaxedAtomicBool value: @IS_NIGHTLY_BUILD@ mirror: always rust: true # Allow control characters appear in composition string. # When this is false, control characters except # CHARACTER TABULATION (horizontal tab) are removed from # both composition string and data attribute of compositionupdate # and compositionend events. - name: dom.compositionevent.allow_control_characters type: bool value: false mirror: always # Compression Streams (CompressionStream/DecompressionStream) - name: dom.compression_streams.enabled type: RelaxedAtomicBool value: true mirror: always # Disable cookie-store API - name: dom.cookieStore.enabled type: RelaxedAtomicBool value: @IS_NIGHTLY_BUILD@ mirror: always # Is support for CSSPseudoElement enabled? - name: dom.css_pseudo_element.enabled type: bool value: false mirror: always # After how many seconds we allow external protocol URLs in iframe when not in # single events - name: dom.delay.block_external_protocol_in_iframes type: uint32_t value: 10 # in seconds mirror: always # Whether the above pref has any effect at all. # Make sure cases like bug 1795380 work before trying to turn this off. See # bug 1680721 for some other context that might be relevant. - name: dom.delay.block_external_protocol_in_iframes.enabled type: bool value: true mirror: always - name: dom.details_group.enabled type: bool value: true mirror: always # Only propagate the open window click permission if the setTimeout() is equal # to or less than this value. - name: dom.disable_open_click_delay type: int32_t value: 1000 mirror: always - name: dom.disable_open_during_load type: bool value: false mirror: always - name: dom.disable_beforeunload type: bool value: false mirror: always - name: dom.require_user_interaction_for_beforeunload type: bool value: true mirror: always # Enable/disable Gecko specific edit commands - name: dom.document.edit_command.contentReadOnly.enabled type: bool value: @IS_NOT_EARLY_BETA_OR_EARLIER@ mirror: always - name: dom.document.edit_command.insertBrOnReturn.enabled type: bool value: @IS_NOT_EARLY_BETA_OR_EARLIER@ mirror: always # Only intended for fuzzing purposes, this will break mozPrintCallback, etc. - name: dom.window_print.fuzzing.block_while_printing type: bool value: false mirror: always # Enable/disable contenteditable="plaintext-only". - name: dom.element.contenteditable.plaintext-only.enabled type: bool value: @IS_NIGHTLY_BUILD@ mirror: always # Whether Dialog elements emit beforetoggle and toggle events during opening and closing. # See https://github.com/whatwg/html/pull/10091 - name: dom.element.dialog.toggle_events.enabled type: bool value: true mirror: always - name: dom.element.transform-getters.enabled type: bool value: false mirror: always # Whether the blocking attribute implementation is enabled, # see https://html.spec.whatwg.org/#blocking-attributes - name: dom.element.blocking.enabled type: RelaxedAtomicBool value: false mirror: always # Whether CustomStateSet is enabled - name: dom.element.customstateset.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Whether the invoketarget attribute implementation is enabled - name: dom.element.invokers.enabled type: bool value: false mirror: always - name: dom.mouse_capture.enabled type: bool value: true mirror: always # Is support for Performance.mozMemory enabled? - name: dom.enable_memory_stats type: bool value: false mirror: always # Enable Performance API # Whether nonzero values can be returned from performance.timing.* - name: dom.enable_performance type: RelaxedAtomicBool value: true mirror: always # Enable Performance Observer API - name: dom.enable_performance_observer type: RelaxedAtomicBool value: true mirror: always # Whether resource timing will be gathered and returned by performance.GetEntries* - name: dom.enable_resource_timing type: bool value: true mirror: always # Whether event timing will be gathered and returned by performance observer* - name: dom.enable_event_timing type: RelaxedAtomicBool value: true mirror: always # Whether the LargestContentfulPaint API will be gathered and returned by performance observer* - name: dom.enable_largest_contentful_paint type: RelaxedAtomicBool value: true mirror: always # Whether performance.GetEntries* will contain an entry for the active document - name: dom.enable_performance_navigation_timing type: bool value: true mirror: always # Whether the scheduler interface will be exposed - name: dom.enable_web_task_scheduling type: RelaxedAtomicBool value: @IS_NIGHTLY_BUILD@ mirror: always # If this is true, it's allowed to fire "cut", "copy" and "paste" events. # Additionally, "input" events may expose clipboard content when inputType # is "insertFromPaste" or something. - name: dom.event.clipboardevents.enabled type: bool value: true mirror: always # Whether Shift+Right click force-opens the context menu - name: dom.event.contextmenu.shift_suppresses_event type: bool value: true mirror: always - name: dom.event.dragexit.enabled type: bool value: @IS_NOT_NIGHTLY_BUILD@ mirror: always # If this pref is set to true, typing a surrogate pair causes one `keypress` # event whose `charCode` stores the unicode code point over 0xFFFF. This is # compatible with Safari and Chrome in non-Windows platforms. # Otherwise, typing a surrogate pair causes two `keypress` events. This is # compatible with legacy web apps which does # `String.fromCharCode(event.charCode)`. - name: dom.event.keypress.dispatch_once_per_surrogate_pair type: bool value: false mirror: always # This is meaningful only when `dispatch_once_per_surrogate_pair` is false. # If this pref is set to true, `.key` of the first `keypress` is set to the # high-surrogate and `.key` of the other is set to the low-surrogate. # Therefore, setting this exposing ill-formed UTF-16 string with `.key`. # (And also `InputEvent.data` if pressed in an editable element.) # Otherwise, `.key` of the first `keypress` is set to the surrogate pair, and # `.key` of the second `keypress` is set to the empty string. - name: dom.event.keypress.key.allow_lone_surrogate type: bool value: @IS_NOT_EARLY_BETA_OR_EARLIER@ mirror: always # Whether the result of screenX, screenY, clientX, clientY, offsetX, offsetY, # x and y of trusted MouseEvent and subclasses may be fractional values. # Enabling this may cause backward compatibility issues. # Note that this pref is referred only when # `dom.event.pointer.fractional_coordinates.enabled` is `true`. - name: dom.event.mouse.fractional_coordinates.trusted.enabled type: bool value: false mirror: always # Whether the result of screenX, screenY, clientX, clientY, offsetX, offsetY, # x and y of untrusted MouseEvent and subclasses may be fractional values. # I.e., this allows web apps to use fractional values with their own DOM events # which have MouseEvent interface. However, this might cause backward # compatibility issues if web apps initializes untrusted events with quotients. # Note that this pref is referred only when # `dom.event.pointer.fractional_coordinates.enabled` is `true`. - name: dom.event.mouse.fractional_coordinates.untrusted.enabled type: bool value: false mirror: always # Whether the result of screenX, screenY, clientX, clientY, offsetX, offsetY, # x and y of PointerEvent may be fractional values (except `click`, `auxclick` # and `contextmenu`) - name: dom.event.pointer.fractional_coordinates.enabled type: bool value: @IS_NIGHTLY_BUILD@ mirror: always # Whether wheel event target's should be grouped. When enabled, all wheel # events that occur in a given wheel transaction have the same event target. - name: dom.event.wheel-event-groups.enabled type: RelaxedAtomicBool value: true mirror: always # Whether WheelEvent should return pixels instead of lines for # WheelEvent.deltaX/Y/Z, when deltaMode hasn't been checked. # # Other browsers don't use line deltas and websites forget to check for it, see # bug 1392460. - name: dom.event.wheel-deltaMode-lines.disabled type: bool value: true mirror: always # Mostly for debugging. Whether we should do the same as # dom.event.wheel-deltaMode-lines.disabled, but unconditionally rather than # only when deltaMode hasn't been checked. - name: dom.event.wheel-deltaMode-lines.always-disabled type: bool value: false mirror: always # A blocklist (list of domains) for the # dom.event.wheel-deltaMode-lines.disabled behavior, in case potential # unforeseen problems with it arrive. - name: dom.event.wheel-deltaMode-lines.always-enabled type: String value: "" mirror: never #if defined(XP_MACOSX) # Whether to disable treating ctrl click as right click - name: dom.event.treat_ctrl_click_as_right_click.disabled type: bool value: @IS_NIGHTLY_BUILD@ mirror: always #endif # Whether Gecko keeps store or forgets the last deepest "enter" event target for # the next "enter" or "leave" event dispatching when the last "over" event # target is removed from the DOM tree. - name: dom.events.mouse-pointer-boundary.keep-enter-targets-after-over-target-removed type: bool value: @IS_EARLY_BETA_OR_EARLIER@ mirror: always # Whether .offset{X,Y} for events targeted at SVG nodes returns bounds relative # to the outer SVG. - name: dom.events.offset-in-svg-relative-to-svg-root type: bool value: true mirror: always # Control whether clipboard.read(), clipboard.write() and ClipboardItem are exposed # to content. - name: dom.events.asyncClipboard.clipboardItem type: bool value: true mirror: always # Skips checking permission and user activation when accessing the clipboard. # Should only be enabled in tests. # Access with Clipboard::IsTestingPrefEnabled(). - name: dom.events.testing.asyncClipboard type: bool value: false mirror: always do_not_use_directly: true # Control whether `navigator.clipboard.readText()` is exposed to content. - name: dom.events.asyncClipboard.readText type: bool value: true mirror: always do_not_use_directly: true # This pref controls whether or not the `protected` dataTransfer state is # enabled. If the `protected` dataTransfer stae is disabled, then the # DataTransfer will be read-only whenever it should be protected, and will not # be disconnected after a drag event is completed. - name: dom.events.dataTransfer.protected.enabled type: bool value: false mirror: always # Whether to hide normal files (i.e. non-images) in dataTransfer inside # the content process. - name: dom.events.dataTransfer.mozFile.enabled type: bool value: true mirror: always - name: dom.events.dataTransfer.imageAsFile.enabled type: bool value: false mirror: always # User interaction timer interval, in ms - name: dom.events.user_interaction_interval type: uint32_t value: 5000 mirror: always # Whether to try to compress touchmove events on IPC layer. - name: dom.events.compress.touchmove type: bool value: true mirror: always # In addition to the above IPC layer compresison, allow touchmove # events to be further coalesced in the child side after they # are sent. - name: dom.events.coalesce.touchmove type: bool value: true mirror: always # Allow mousemove events to be coalesced in the child side after they are sent. - name: dom.events.coalesce.mousemove type: bool value: true mirror: always # Expose Window.TextEvent and make the builtin editors dispatch `textInput` # event as a default action of `beforeinput`. - name: dom.events.textevent.enabled type: bool value: true mirror: always # Whether to expose test interfaces of various sorts - name: dom.expose_test_interfaces type: bool value: false mirror: always - name: dom.fetchKeepalive.enabled type: RelaxedAtomicBool value: true mirror: always # The maximum number of pending fetch keepalive requests per browser instance - name: dom.fetchKeepalive.total_request_limit type: RelaxedAtomicUint32 value: 500 mirror: always # The maximum number of pending fetch keepalive requests per origin - name: dom.fetchKeepalive.request_limit_per_origin type: RelaxedAtomicUint32 value: 250 mirror: always - name: dom.fetchObserver.enabled type: RelaxedAtomicBool value: false mirror: always # Whether to set the incremental flag on the top level document's # priority header - name: dom.document_priority.incremental type: RelaxedAtomicBool value: true mirror: always # Allow the content process to create a File from a path. This is allowed just # on parent process, on 'file' Content process, or for testing. - name: dom.file.createInChild type: RelaxedAtomicBool value: false mirror: always # Support @autocomplete values for form autofill feature. - name: dom.forms.autocomplete.formautofill type: bool value: false mirror: always # Is support for HTMLElement.autocorrect enabled? - name: dom.forms.autocorrect type: bool value: @IS_NIGHTLY_BUILD@ mirror: always # Only trusted submit event could trigger form submission. - name: dom.forms.submit.trusted_event_only type: bool value: false mirror: always # This pref just controls whether we format the number with grouping separator # characters when the internal value is set or updated. It does not stop the # user from typing in a number and using grouping separators. - name: dom.forms.number.grouping type: bool value: false mirror: always # The interval in milliseconds between two Escape key events where the second # key event will exit fullscreen, even if it is consumed. - name: dom.fullscreen.force_exit_on_multiple_escape_interval type: uint32_t value: 500 mirror: always # Whether the Gamepad API is enabled - name: dom.gamepad.enabled type: bool value: true mirror: always # Is Gamepad Extension API enabled? - name: dom.gamepad.extensions.enabled type: bool value: true mirror: always # Is LightIndicator API enabled in Gamepad Extension API? - name: dom.gamepad.extensions.lightindicator type: bool value: false mirror: always # Is MultiTouch API enabled in Gamepad Extension API? - name: dom.gamepad.extensions.multitouch type: bool value: false mirror: always # Is Gamepad vibrate haptic feedback function enabled? - name: dom.gamepad.haptic_feedback.enabled type: bool value: true mirror: always - name: dom.gamepad.non_standard_events.enabled type: bool value: @IS_NOT_RELEASE_OR_BETA@ mirror: always - name: dom.gamepad.test.enabled type: RelaxedAtomicBool value: false mirror: always # W3C draft ImageCapture API - name: dom.imagecapture.enabled type: bool value: false mirror: always # The root margin for image lazy loading, defined as four (value, percentage) # pairs. - name: dom.image-lazy-loading.root-margin.top type: float value: 600 mirror: always - name: dom.image-lazy-loading.root-margin.top.percentage type: bool value: false mirror: always - name: dom.image-lazy-loading.root-margin.bottom type: float value: 600 mirror: always - name: dom.image-lazy-loading.root-margin.bottom.percentage type: bool value: false mirror: always - name: dom.image-lazy-loading.root-margin.left type: float value: 600 mirror: always - name: dom.image-lazy-loading.root-margin.left.percentage type: bool value: false mirror: always - name: dom.image-lazy-loading.root-margin.right type: float value: 600 mirror: always - name: dom.image-lazy-loading.root-margin.right.percentage type: bool value: false mirror: always # Enable indexedDB in private browsing mode with encryption - name: dom.indexedDB.privateBrowsing.enabled type: RelaxedAtomicBool value: true mirror: always # A pref that is used to slow down connection idle maintenance for testing # purposes. - name: dom.indexedDB.connectionIdleMaintenance.pauseOnConnectionThreadMs type: RelaxedAtomicUint32 value: 0 mirror: always # Whether or not indexedDB test mode is enabled. - name: dom.indexedDB.testing type: RelaxedAtomicBool value: false mirror: always # Whether or not indexedDB experimental features are enabled. - name: dom.indexedDB.experimental type: RelaxedAtomicBool value: false mirror: always # Whether or not indexedDB preprocessing is enabled. - name: dom.indexedDB.preprocessing type: RelaxedAtomicBool value: false mirror: always # A pref that is used to slow down database initialization for testing purposes. - name: dom.indexedDB.databaseInitialization.pauseOnIOThreadMs type: RelaxedAtomicUint32 value: 0 mirror: always # How innerWidth / innerHeight return rounded or fractional sizes. # # 0 or others: Do not round at all. # 1: Round. # 2: Truncate. # # NOTE(emilio): Fractional sizes are not web-compatible, see the regressions # from bug 1676843, but we want to expose the fractional sizes (probably in # another API) one way or another, see [1], so we're keeping the code for the # time being. # # [1]: https://github.com/w3c/csswg-drafts/issues/5260 - name: dom.innerSize.rounding type: uint32_t value: 1 mirror: always # Whether we conform to Input Events Level 1 or Input Events Level 2. # true: conforming to Level 1 # false: conforming to Level 2 - name: dom.input_events.conform_to_level_1 type: bool value: true mirror: always # Whether we allow BrowsingContextGroup to suspend input events - name: dom.input_events.canSuspendInBCG.enabled type: bool value: false mirror: always # The minimum number of ticks after page navigation # that need to occur before user input events are allowed to be handled. - name: dom.input_events.security.minNumTicks type: uint32_t value: 3 mirror: always # The minimum elapsed time (in milliseconds) after page navigation # for user input events are allowed to be handled. - name: dom.input_events.security.minTimeElapsedInMS type: uint32_t value: 100 mirror: always # By default user input handling delay is disabled (mostly) for testing , # this is used for forcefully enable it for certain tests. - name: dom.input_events.security.isUserInputHandlingDelayTest type: bool value: false mirror: always # The maximum time (milliseconds) we reserve for handling input events in each # frame. - name: dom.input_event_queue.duration.max type: uint32_t value: 8 mirror: always - name: dom.interactive_widget_default_resizes_visual type: RelaxedAtomicBool value: true mirror: always # How often to check for CPOW timeouts (ms). CPOWs are only timed # out by the hang monitor. - name: dom.ipc.cpow.timeout type: uint32_t value: 500 mirror: always #ifdef MOZ_ENABLE_FORKSERVER - name: dom.ipc.forkserver.enable type: bool #if defined(MOZ_CODE_COVERAGE) || defined(MOZ_ASAN) || defined(MOZ_TSAN) || defined(MOZ_MSAN) || defined(MOZ_UBSAN) value: false #else value: @IS_NIGHTLY_BUILD@ #endif mirror: once #endif #ifdef MOZ_WIDGET_GTK # # Avoid the use of GTK in content processes if possible, by running # them in headless mode, to conserve resources (e.g., connections to # the X server). See the usage in `ContentParent.cpp` for the full # definition of "if possible". # # This does not affect sandbox policies; content processes may still # dynamically connect to the display server for, e.g., WebGL. - name: dom.ipc.avoid-gtk type: bool value: true mirror: always #endif # Whether or not to collect a paired minidump when force-killing a # content process. - name: dom.ipc.tabs.createKillHardCrashReports type: bool value: @IS_NOT_RELEASE_OR_BETA@ mirror: once # Enable e10s hang monitoring (slow script checking and plugin hang detection). - name: dom.ipc.processHangMonitor type: bool value: true mirror: once # Whether we report such process hangs - name: dom.ipc.reportProcessHangs type: RelaxedAtomicBool # Don't report hangs in DEBUG builds. They're too slow and often a # debugger is attached. #ifdef DEBUG value: false #else value: true #endif mirror: always # If true, disables non-required re-use of content processes. This can be used # in tests to force a new process to be used whenever a process selection # decision is made. Setting this pref can cause dom.ipc.processCount limits to # be exceeded. # WARNING: This will exceed even process limits for the extension or # privilegedAbout remote types, which may lead to unexpected breakage! # Should only be used for testing. - name: dom.ipc.disableContentProcessReuse type: bool value: false mirror: always # If non-zero, a grace delay (in milliseconds) during which unused content # processes are kept available for re-use to avoid unnecessary process churn. - name: dom.ipc.processReuse.unusedGraceMs type: uint32_t value: 0 mirror: always # Process launch delay (in milliseconds). - name: dom.ipc.processPrelaunch.delayMs type: uint32_t # This number is fairly arbitrary ... the intention is to put off # launching another app process until the last one has finished # loading its content, to reduce CPU/memory/IO contention. value: 1000 mirror: always - name: dom.ipc.processPrelaunch.startupDelayMs type: uint32_t # delay starting content processes for a short time after browser start # to provide time for the UI to come up value: 1000 mirror: always # Process preallocation cache # Only used in fission; in e10s we use 1 always - name: dom.ipc.processPrelaunch.fission.number type: uint32_t value: 3 mirror: always # Limit preallocated processes below this memory size (in MB) - name: dom.ipc.processPrelaunch.lowmem_mb type: uint32_t value: 4096 mirror: always - name: dom.ipc.processPriorityManager.enabled type: bool value: true mirror: always - name: dom.ipc.processPriorityManager.testMode type: bool value: false mirror: always - name: dom.ipc.processPriorityManager.backgroundPerceivableGracePeriodMS type: uint32_t #if defined(MOZ_WIDGET_ANDROID) value: 3000 #else value: 0 #endif mirror: always - name: dom.ipc.processPriorityManager.backgroundGracePeriodMS type: uint32_t #if defined(MOZ_WIDGET_ANDROID) value: 3000 #else value: 0 #endif mirror: always #ifdef XP_WIN - name: dom.ipc.processPriorityManager.backgroundUsesEcoQoS type: bool value: false mirror: always #endif # Support for input type=month, type=week. By default, disabled. - name: dom.forms.datetime.others type: bool value: @IS_ANDROID@ mirror: always - name: dom.forms.always_allow_pointer_events.enabled type: bool value: true mirror: always # Is support for key events and focus events on disabled elements enabled? - name: dom.forms.always_allow_key_and_focus_events.enabled type: bool value: @IS_EARLY_BETA_OR_EARLIER@ mirror: always # Whether to disable only the descendants or the parent fieldset element too # Note that this still allows it to be selected by `:disable`. - name: dom.forms.fieldset_disable_only_descendants.enabled type: bool value: @IS_EARLY_BETA_OR_EARLIER@ mirror: always # Does mousewheel-scrolling over a focused or # field cause the value to increase/decrease (rather # than scrolling the page)? - name: dom.input.number_and_range_modified_by_mousewheel type: RelaxedAtomicBool value: false mirror: always # Whether to allow or disallow web apps to cancel `beforeinput` events caused # by MozEditableElement#setUserInput() which is used by autocomplete, autofill # and password manager. - name: dom.input_event.allow_to_cancel_set_user_input type: bool value: false mirror: always # How long a content process can take before closing its IPC channel # after shutdown is initiated. If the process exceeds the timeout, # we fear the worst and kill it. - name: dom.ipc.tabs.shutdownTimeoutSecs type: RelaxedAtomicUint32 #if !defined(DEBUG) && !defined(MOZ_ASAN) && !defined(MOZ_VALGRIND) && !defined(MOZ_TSAN) value: 20 #else value: 0 #endif mirror: always # Whether a native event loop should be used in the content process. - name: dom.ipc.useNativeEventProcessing.content type: RelaxedAtomicBool #if defined(XP_WIN) || defined(XP_MACOSX) value: false #else value: true #endif mirror: always # If this is true, TextEventDispatcher dispatches keydown and keyup events # even during composition (keypress events are never fired during composition # even if this is true). - name: dom.keyboardevent.dispatch_during_composition type: bool value: true mirror: always # Enable/disable KeyboardEvent.initKeyEvent function - name: dom.keyboardevent.init_key_event.enabled type: bool value: false mirror: always # Enable/disable KeyboardEvent.initKeyEvent function in addons even if it's # disabled. - name: dom.keyboardevent.init_key_event.enabled_in_addons type: bool value: @IS_NOT_NIGHTLY_BUILD@ mirror: always # If this is true, keypress events for non-printable keys are dispatched only # for event listeners of the system event group in web content. - name: dom.keyboardevent.keypress.dispatch_non_printable_keys_only_system_group_in_content type: bool value: true mirror: always # If this is true, "keypress" event's keyCode value and charCode value always # become same if the event is not created/initialized by JS. - name: dom.keyboardevent.keypress.set_keycode_and_charcode_to_same_value type: bool value: true mirror: always # Whether "W3C Web Manifest" processing is enabled - name: dom.manifest.enabled type: bool value: true mirror: always # Enable mapped array buffer by default. - name: dom.mapped_arraybuffer.enabled type: bool value: true mirror: always # Autoplay Policy Detection https://w3c.github.io/autoplay/ - name: dom.media.autoplay-policy-detection.enabled type: RelaxedAtomicBool value: true mirror: always # WebCodecs API - name: dom.media.webcodecs.enabled type: RelaxedAtomicBool #if defined(MOZ_WIDGET_ANDROID) value: @IS_NIGHTLY_BUILD@ #else value: true #endif mirror: always # WebCodecs API - Image decoder - name: dom.media.webcodecs.image-decoder.enabled type: RelaxedAtomicBool value: true mirror: always # Number of seconds of very quiet or silent audio before considering the audio # inaudible. - name: dom.media.silence_duration_for_audibility type: AtomicFloat value: 2.0f mirror: always # Inform mozjemalloc that the foreground content processes can keep more dirty # pages in memory. - name: dom.memory.foreground_content_processes_have_larger_page_cache type: bool value: true mirror: always # 0 no-op # 1 free dirty mozjemalloc pages # 2 trigger memory-pressure/heap-minimize # 3 trigger memory-pressure/low-memory - name: dom.memory.memory_pressure_on_background type: uint32_t value: 0 mirror: always # Enable meta-viewport support in remote APZ-enabled frames. - name: dom.meta-viewport.enabled type: RelaxedAtomicBool value: false mirror: always # Timeout clamp in ms for timeouts we clamp. - name: dom.min_timeout_value type: RelaxedAtomicInt32 value: 4 mirror: always # Timeout clamp in ms for background windows. - name: dom.min_background_timeout_value type: int32_t value: 1000 mirror: always # Timeout clamp in ms for background windows when throttling isn't enabled. - name: dom.min_background_timeout_value_without_budget_throttling type: int32_t value: 1000 mirror: always # Are missing-property use counters for certain DOM attributes enabled? - name: dom.missing_prop_counters.enabled type: bool value: true mirror: always # Whether to dispatch mutation events. - name: dom.mutation_events.enabled type: bool value: true mirror: always # Limit of location change caused by content scripts in a time span per # BrowsingContext. This includes calls to History and Location APIs. - name: dom.navigation.navigationRateLimit.count type: uint32_t value: 200 mirror: always # Time span in seconds for location change rate limit. - name: dom.navigation.navigationRateLimit.timespan type: uint32_t value: 10 mirror: always # Whether to allow and element loads to be retargeted to an # external application or download. - name: dom.navigation.object_embed.allow_retargeting type: bool value: false mirror: always # Whether the navigation API will be exposed. - name: dom.navigation.webidl.enabled type: RelaxedAtomicBool value: false mirror: always do_not_use_directly: true # Network Information API # This feature is not available on Firefox desktop. It exposes too much # user information. Let's be consistent and disable it on Android. # But let's keep it around in case it becomes necessary for webcompat # reasons # https://bugzilla.mozilla.org/show_bug.cgi?id=1637922 - name: dom.netinfo.enabled type: RelaxedAtomicBool value: false mirror: always # Whether we should open noopener links in a new process. - name: dom.noopener.newprocess.enabled type: bool value: true mirror: always # Whether origin trials are enabled. - name: dom.origin-trials.enabled type: bool value: true mirror: always # Whether we use the test key to verify tokens. - name: dom.origin-trials.test-key.enabled type: bool value: false mirror: always # Origin trial state for "TestTrial". # 0: normal, 1: always-enabled, 2: always-disabled - name: dom.origin-trials.test-trial.state type: RelaxedAtomicInt32 value: 0 mirror: always # Origin trial state for COEP: Credentialless. # 0: normal, 1: always-enabled, 2: always-disabled - name: dom.origin-trials.coep-credentialless.state type: RelaxedAtomicInt32 value: 0 mirror: always # Origin trial state for Private Attribution # 0: normal, 1: always-enabled, 2: always-disabled - name: dom.origin-trials.private-attribution.state type: RelaxedAtomicInt32 #ifdef ANDROID value: 2 #else value: 0 #endif mirror: always # User pref to control whether Private Attribution # information should be collected / submitted. - name: dom.private-attribution.submission.enabled type: bool value: @IS_NOT_ANDROID@ mirror: always # Is support for Window.paintWorklet enabled? - name: dom.paintWorklet.enabled type: bool value: false mirror: always # Enable/disable the PaymentRequest API - name: dom.payments.request.enabled type: bool value: false mirror: always # Whether a user gesture is required to call PaymentRequest.prototype.show(). - name: dom.payments.request.user_interaction_required type: bool value: true mirror: always # Time in milliseconds for PaymentResponse to wait for # the Web page to call complete(). - name: dom.payments.response.timeout type: uint32_t value: 5000 mirror: always # Enable printing performance marks/measures to log - name: dom.performance.enable_user_timing_logging type: RelaxedAtomicBool value: false mirror: always # Enable notification of performance timing - name: dom.performance.enable_notify_performance_timing type: bool value: false mirror: always # Is support for PerformanceTiming.timeToContentfulPaint enabled? - name: dom.performance.time_to_contentful_paint.enabled type: bool value: false mirror: always # Is support for PerformanceTiming.timeToFirstInteractive enabled? - name: dom.performance.time_to_first_interactive.enabled type: bool value: false mirror: always # Is support for PerformanceTiming.timeToNonBlankPaint enabled? - name: dom.performance.time_to_non_blank_paint.enabled type: bool value: false mirror: always # Is support for Element.requestPointerLock enabled? # This is added for accessibility purpose. When user has no way to exit # pointer lock (e.g. no keyboard available), they can use this pref to # disable the Pointer Lock API altogether. - name: dom.pointer-lock.enabled type: bool value: true mirror: always # re-SAB: Whether to allow postMessage of a SharedArrayBuffer if various # preconditions related to COOP and COEP are met - name: dom.postMessage.sharedArrayBuffer.withCOOP_COEP type: bool value: true mirror: once # Overridden in all.js on RELEASE_OR_BETA in order to add the locked attribute. - name: dom.postMessage.sharedArrayBuffer.bypassCOOP_COEP.insecure.enabled type: RelaxedAtomicBool value: false mirror: always # Should we speculatively prefetch dns for anchor elements on http documents - name: dom.prefetch_dns_for_anchor_http_document type: bool value: true mirror: always # Should we speculatively prefetch dns for anchor elements on https documents - name: dom.prefetch_dns_for_anchor_https_document type: bool value: false mirror: always # This currently only affects XHTML. For XUL the cache is always allowed. - name: dom.prototype_document_cache.enabled type: bool value: true mirror: always # Push - name: dom.push.enabled type: RelaxedAtomicBool value: true mirror: always # Indicate the deprecated aesgcm support in PushManager.supportedContentEncodings. # # This does not affect actual aesgcm support, any new and existing subscriptions # can still use aesgcm regardless of this pref. - name: dom.push.indicate_aesgcm_support.enabled type: RelaxedAtomicBool value: false mirror: always # Preference that is primarily used for testing of problematic file paths. # It can also be used for switching between different storage directories, but # such feature is not officially supported. - name: dom.quotaManager.storageName type: String value: "storage" mirror: never # An upper limit for the "age" of an origin. Any origin which is older than the # threshold is considered as unaccessed. That doesn't necessarily mean that # such origins will be immediatelly archived. They will be archived only when # dom.quotaManager.checkQuotaInfoLoadTime is true and loading of quota info # takes a long time (dom.quotaManager.longQuotaInfoLoadTimeThresholdMs is used # to decide what is a long quota info load time). - name: dom.quotaManager.unaccessedForLongTimeThresholdSec type: RelaxedAtomicUint32 value: 33696000 # 13 months mirror: always # Should we try to load origin information from the cache? # See bug 1563023 for more details. - name: dom.quotaManager.loadQuotaFromCache type: RelaxedAtomicBool value: true mirror: always # Should we check build ID as part of the cache validation? # When enabled, the cache is invalidated on any upgrade (or downgrade), # ensuring that changes in how quota usage is calculated can't cause # inconsistencies at the cost of a slower initialization. Currently, this # should only be set to false in tests using a packaged profile that inherently # includes a build id different from the building running the tests. In the # future this may be set to false if we are confident that we have sufficiently # thorough schema versioning. - name: dom.quotaManager.caching.checkBuildId type: RelaxedAtomicBool value: true mirror: always # Should we check quota info load time and eventually archive some unaccessed # origins if loading of quota info takes a long time ? - name: dom.quotaManager.checkQuotaInfoLoadTime type: RelaxedAtomicBool value: true mirror: always # An upper limit for quota info load time, anything which takes longer than the # threshold is considered as long quota info load time. - name: dom.quotaManager.longQuotaInfoLoadTimeThresholdMs type: RelaxedAtomicUint32 value: 21000 # 21 seconds mirror: always # Preference that users can set to override temporary storage smart limit # calculation. - name: dom.quotaManager.temporaryStorage.fixedLimit type: RelaxedAtomicInt32 value: -1 mirror: always # Should we do lazy initialization of origins ? # When enabled, origins for temporary storage are not initialized during # temporary storage initialization, they are initialized lazily instead. # If there are other origins in the group, they are initialized all together. # This feature is currently still in development and experimental, not # recommended for normal use yet. - name: dom.quotaManager.temporaryStorage.lazyOriginInitialization type: RelaxedAtomicBool value: false mirror: always # Should we trigger initialization of all temporary origins in the background? # When enabled, temporary origins collected during temporary storage # initialization are initialized in the background. The background # initialization of temporary origins is always done for entire groups of # origins to preserve consistency of quota checks related to the group limit. # This feature is currently still in development and experimental, not # recommended for normal use yet. - name: dom.quotaManager.temporaryStorage.triggerOriginInitializationInBackground type: RelaxedAtomicBool value: false mirror: always # A pref that is used to slow down origin operations for testing purposes. - name: dom.quotaManager.originOperations.pauseOnIOThreadMs type: RelaxedAtomicUint32 value: 0 mirror: always # A pref that is used to slow down storage initialization for testing purposes. - name: dom.quotaManager.storageInitialization.pauseOnIOThreadMs type: RelaxedAtomicUint32 value: 0 mirror: always # A pref that is used to slow down origin initialization for testing purposes. - name: dom.quotaManager.originInitialization.pauseOnIOThreadMs type: RelaxedAtomicUint32 value: 0 mirror: always # A pref that is used to enable testing features. - name: dom.quotaManager.testing type: SequentiallyConsistentAtomicBool value: false mirror: always #if defined(XP_WIN) # Preference that is used to set nsILocalFileWin::useDOSDevicePathSyntax # attribute for all local file instances created by QuotaManager and its # clients. The value of this preference is cached so changing the preference # during runtime has no effect. # See bug 1626846 for setting this to false by default. - name: dom.quotaManager.useDOSDevicePathSyntax type: RelaxedAtomicBool value: true mirror: always do_not_use_directly: true # Preference that is used to enable the hack for overrriding xFullPathname in # QuotaVFS. - name: dom.quotaManager.overrideXFullPathname type: RelaxedAtomicBool value: true mirror: always #elif defined(XP_UNIX) # Preference that is used to enable the overriding of Unix xFullPathname # implementation in QuotaVFS. - name: dom.quotaManager.overrideXFullPathnameUnix type: RelaxedAtomicBool value: true mirror: always #endif # How many times we should retry directory removal or renaming if access was # denied? - name: dom.quotaManager.directoryRemovalOrRenaming.maxRetries type: RelaxedAtomicUint32 #ifdef XP_WIN value: 10 #else value: 0 #endif mirror: always # How long we should wait between retries (in milliseconds)? - name: dom.quotaManager.directoryRemovalOrRenaming.delayMs type: RelaxedAtomicUint32 value: 200 mirror: always #ifdef MOZ_BACKGROUNDTASKS # Use a Background Task to delete files at shutdown. - name: dom.quotaManager.backgroundTask.enabled type: bool #ifdef XP_MACOSX # Needs to figure out how to prevent bug 1827486. value: false #else value: true #endif mirror: never #endif # A pref that specifies one or more failure categories to trigger artificial # failures for testing purposes. Multiple categories can be combined using # bitwise OR to represent various failure points within the code. - name: dom.quotaManager.artificialFailure.categories type: RelaxedAtomicUint32 value: 0 mirror: always # A probability (0-100) used to determine the likelihood of triggering an # artificial failure for testing purposes. This value is applied when the # specified failure categories match to decide if the failure should occur. - name: dom.quotaManager.artificialFailure.probability type: RelaxedAtomicUint32 value: 0 mirror: always # An error code used to trigger an artificial failure for testing purposes. # This code is returned when the specified failure categories match and the # failure is triggered based on the configured probability. - name: dom.quotaManager.artificialFailure.errorCode type: RelaxedAtomicUint32 value: 0 mirror: always # Use to control to dump CheckedUnsafePtr creation stack and assignment stacks. - name: dom.checkedUnsafePtr.dumpStacks.enabled type: RelaxedAtomicBool value: false mirror: always # A pref that is used to slow down database initialization for testing purposes. - name: dom.simpledb.databaseInitialization.pauseOnIOThreadMs type: RelaxedAtomicUint32 value: 0 mirror: always # Determines within what distance of a tick mark, in pixels, dragging an input # range range will snap the range's value to that tick mark. By default, this is # half the default width of the range thumb. - name: dom.range_element.magnet_effect_threshold type: float value: 10.0f mirror: always # Reporting API. - name: dom.reporting.enabled type: RelaxedAtomicBool value: false mirror: always - name: dom.reporting.testing.enabled type: RelaxedAtomicBool value: false mirror: always - name: dom.reporting.featurePolicy.enabled type: RelaxedAtomicBool value: false mirror: always - name: dom.reporting.crash.enabled type: RelaxedAtomicBool value: false mirror: always - name: dom.reporting.header.enabled type: RelaxedAtomicBool value: false mirror: always # In seconds. The timeout to remove not-active report-to endpoints. - name: dom.reporting.cleanup.timeout type: uint32_t value: 3600 mirror: always # Any X seconds the reports are dispatched to endpoints. - name: dom.reporting.delivering.timeout type: uint32_t value: 5 mirror: always # How many times the delivering of a report should be tried. - name: dom.reporting.delivering.maxFailures type: uint32_t value: 3 mirror: always # How many reports should be stored in the report queue before being delivered. - name: dom.reporting.delivering.maxReports type: uint32_t value: 100 mirror: always # Enable Screen Orientation lock - name: dom.screenorientation.allow-lock type: bool value: @IS_NIGHTLY_BUILD@ mirror: always # Enable Screen Wake Lock API - name: dom.screenwakelock.enabled type: bool value: true mirror: always # Whether to enable the JavaScript start-up cache. This causes one of the first # execution to record the bytecode of the JavaScript function used, and save it # in the existing cache entry. On the following loads of the same script, the # bytecode would be loaded from the cache instead of being generated once more. - name: dom.script_loader.bytecode_cache.enabled type: bool value: true mirror: always # Ignore the heuristics of the bytecode cache, and always record on the first # visit. (used for testing purposes). # Choose one strategy to use to decide when the bytecode should be encoded and # saved. The following strategies are available right now: # * -2 : (reader mode) The bytecode cache would be read, but it would never # be saved. # * -1 : (eager mode) The bytecode would be saved as soon as the script is # seen for the first time, independently of the size or last access # time. # * 0 : (default) The bytecode would be saved in order to minimize the # page-load time. # # Other values might lead to experimental strategies. For more details, have a # look at: ScriptLoader::ShouldCacheBytecode function. - name: dom.script_loader.bytecode_cache.strategy type: int32_t value: 0 mirror: always # Select which parse/delazification strategy should be used while parsing # scripts off-main-thread. (see CompileOptions.h, DelazificationOption enum) # # 0: On-demand only. Delazification will be triggered only on the main thread # before the execution of the function. # # 1: Compare on-demand delazification (= 0) with concurrent depth-first # delazification (= 2). # # 2: Depth-first. Delazify all functions off-thread in the order of appearance # in the source. # # 3: Large-first. Delazify all functions off-thread starting with the largest # functions first, and the smallest as the last one to be delazified, where # the size of function is measured in bytes between the start to the end of # the function. # # 255: Parse everything eagerly, from the first parse. All functions are parsed # at the same time as the top-level of a file. - name: dom.script_loader.delazification.strategy type: uint32_t value: 255 mirror: always # Maximum total size after which the delazification strategy, specified by # `dom.script_loader.delazification.strategy`, is no longer applied, and the # on-demand strategy is used by default. # # -1 disable the threshold, and delazification strategy is applied to all # scripts. # # Default value is 10MB for utf8 scripts. - name: dom.script_loader.delazification.max_size type: int32_t value: 10485760 mirror: always # Minimum memory, in GB, required to enable delazification strategy, specified # by `dom.script_loader.delazification.strategy`. Otherwise, the on-demand # delazification strategy is used. - name: dom.script_loader.delazification.min_mem type: int32_t value: 2 mirror: always # Enable speculative off main thread parsing of external scripts as # soon as they are fetched. - name: dom.script_loader.external_scripts.speculative_omt_parse.enabled type: bool value: true mirror: always # Speculatively compile non parser inserted scripts - name: dom.script_loader.external_scripts.speculate_non_parser_inserted.enabled type: bool value: false mirror: always # Speculatively compile async scripts - name: dom.script_loader.external_scripts.speculate_async.enabled type: bool value: false mirror: always # Speculatively compile link preload scripts - name: dom.script_loader.external_scripts.speculate_link_preload.enabled type: bool value: false mirror: always # Cache stencil across navigation - name: dom.script_loader.navigation_cache type: bool value: false mirror: always - name: dom.securecontext.allowlist_onions type: bool value: false mirror: always # This pref enables the featurePolicy header support. - name: dom.security.featurePolicy.header.enabled type: bool value: false mirror: always - name: dom.security.featurePolicy.experimental.enabled type: bool value: false mirror: always # Expose the 'featurePolicy' attribute in document and HTMLIFrameElement - name: dom.security.featurePolicy.webidl.enabled type: bool value: false mirror: always # Perform IPC based Principal vetting in ContentParent - name: dom.security.enforceIPCBasedPrincipalVetting type: RelaxedAtomicBool value: true mirror: always # For testing purposes only: Flipping this pref to true allows # to skip the allowlist for about: pages and do not ship with a # CSP and NS_ASSERT right away. - name: dom.security.skip_about_page_csp_allowlist_and_assert type: RelaxedAtomicBool value: false mirror: always # For testing purposes only: Flipping this pref to true allows # to skip the assertion that every about page ships with a CSP. - name: dom.security.skip_about_page_has_csp_assert type: RelaxedAtomicBool value: false mirror: always # For testing purposes only: Flipping this pref to true allows # to skip the assertion that HTML fragments (e.g. innerHTML) can # not be used within chrome code or about: pages. - name: dom.security.skip_html_fragment_assertion type: RelaxedAtomicBool value: false mirror: always # For testing purposes only; Flipping this pref to true allows # to skip the assertion that remote scripts can not be loaded # in system privileged contexts. - name: dom.security.skip_remote_script_assertion_in_system_priv_context type: RelaxedAtomicBool value: false mirror: always # If and only if true, support for Trusted Types # (https://w3c.github.io/trusted-types/dist/spec/) is enabled. - name: dom.security.trusted_types.enabled type: RelaxedAtomicBool value: False mirror: always # If true, all content requests will get upgraded to HTTPS:// # (some Firefox functionality requests, like OCSP will not be affected) - name: dom.security.https_only_mode type: RelaxedAtomicBool value: false mirror: always # If true, all content requests in Private Browsing Mode will get # upgraded to HTTPS://. (If dom.security.https_only_mode is set # to true then this pref has no effect) - name: dom.security.https_only_mode_pbm type: RelaxedAtomicBool value: false mirror: always # If true, sends http background request for top-level sites to # counter long timeouts. - name: dom.security.https_only_mode_send_http_background_request type: RelaxedAtomicBool value: true mirror: always # Time limit, in milliseconds, before sending the http background # request for HTTPS-Only and HTTPS-First - name: dom.security.https_only_fire_http_request_background_timer_ms type: RelaxedAtomicUint32 value: 3000 mirror: always # If true, tries to break upgrade downgrade cycles where https-only tries # to upgrad ethe connection, but the website tries to downgrade again. - name: dom.security.https_only_mode_break_upgrade_downgrade_endless_loop type: RelaxedAtomicBool value: true mirror: always # If true and HTTPS-only mode is enabled, requests # to local IP addresses are also upgraded - name: dom.security.https_only_mode.upgrade_local type: RelaxedAtomicBool value: false mirror: always # If true and HTTPS-only mode is enabled, requests # to .onion hosts are also upgraded - name: dom.security.https_only_mode.upgrade_onion type: RelaxedAtomicBool value: false mirror: always # WARNING: Don't ever update that pref manually! It is only used # for telemetry purposes and allows to reason about retention of # the pref dom.security.https_only_mode from above. - name: dom.security.https_only_mode_ever_enabled type: RelaxedAtomicBool value: false mirror: always # WARNING: Don't ever update that pref manually! It is only used # for telemetry purposes and allows to reason about retention of # the pref dom.security.https_only_mode_pbm from above. - name: dom.security.https_only_mode_ever_enabled_pbm type: RelaxedAtomicBool value: false mirror: always # If true checks for secure www connections when https fails # and gives the user suggestions on the error page - name: dom.security.https_only_mode_error_page_user_suggestions type: RelaxedAtomicBool value: false mirror: always # If true, top-level request will get upgraded to HTTPS and # downgraded again if the request failed. - name: dom.security.https_first type: RelaxedAtomicBool value: @IS_EARLY_BETA_OR_EARLIER@ mirror: always # If true, HTTPS-First will upgrade non-default ports - name: dom.security.https_first_for_custom_ports type: RelaxedAtomicBool value: true mirror: always # If true, top-level requests in Private Browsing Mode will get # upgraded to HTTPS. (If dom.security.https_first # is set to true then this pref has no effect) - name: dom.security.https_first_pbm type: RelaxedAtomicBool value: true mirror: always # If true, top-level requests that are initiated from the address # bar and with an empty scheme get upgraded to HTTPS # with a fallback - name: dom.security.https_first_schemeless type: RelaxedAtomicBool value: true mirror: always # If true, will add a special temporary HTTPS-First exception for a site when a # HTTPS-First upgrade fails. - name: dom.security.https_first_add_exception_on_failure type: RelaxedAtomicBool value: true mirror: always - name: dom.security.https_first_exception_lifetime type: uint32_t value: 7*24*60*60*1000 # 7 days in milliseconds mirror: always - name: dom.security.unexpected_system_load_telemetry_enabled type: bool value: true mirror: always # pref controls `Sanitizer` API being exposed # https://wicg.github.io/sanitizer-api/ - name: dom.security.sanitizer.enabled type: bool value: false mirror: always # Pref that controls the Element.setHTML API idenpendetly of the sanitizer # API. - name: dom.security.setHTML.enabled type: bool value: false mirror: always # Logs elements and attributes removed by the Sanitizer API to the console. - name: dom.security.sanitizer.logging type: bool value: false mirror: always # pref controls credential chooser UI for testing. When true, UI is not shown and # either a credential with ID `wpt-pick-me` is selected, or none. - name: dom.security.credentialmanagement.chooser.testing.enabled type: bool value: false mirror: always # pref controls `identity` credentials being exposed - name: dom.security.credentialmanagement.identity.enabled type: bool value: false mirror: always # pref controls "heavyweight" network discoverable `identity` credentials being exposed - name: dom.security.credentialmanagement.identity.heavyweight.enabled type: bool value: false mirror: always # pref controls storable "lightweight" `identity` credentials being exposed - name: dom.security.credentialmanagement.identity.lightweight.enabled type: bool value: false mirror: always # pref controls `identity` credential UI for testing. When true, UI is not shown and # the first option in the account and provider lists are chosen - name: dom.security.credentialmanagement.identity.select_first_in_ui_lists type: bool value: false mirror: always # pref controls `identity` credential platform behavior for testing. When true, # the .well-known file check is not performed. - name: dom.security.credentialmanagement.identity.test_ignore_well_known type: bool value: false mirror: always # pref controls whether we should delay identity credential rejections at all - name: dom.security.credentialmanagement.identity.reject_delay.enabled type: bool value: true mirror: always # pref controls how long we should delay identity credential rejections if enabled - name: dom.security.credentialmanagement.identity.reject_delay.duration_ms type: uint32_t value: 120000 mirror: always # Enforce origin check whenever a content process tries to set a document URI - name: dom.security.setdocumenturi type: bool value: true mirror: always # Whether or not selection events on text controls are enabled. - name: dom.select_events.textcontrols.selectionchange.enabled type: bool value: true mirror: always - name: dom.select_events.textcontrols.selectstart.enabled type: bool value: false mirror: always - name: dom.select.showPicker.enabled type: bool value: true mirror: always - name: dom.send_after_paint_to_content type: bool value: false mirror: always - name: dom.separate_event_queue_for_post_message.enabled type: bool value: true mirror: always - name: dom.arena_allocator.enabled type: bool value: true mirror: once - name: dom.serviceWorkers.enabled type: RelaxedAtomicBool value: true mirror: always - name: dom.serviceWorkers.navigationPreload.enabled type: RelaxedAtomicBool value: true mirror: always # Mitigates ServiceWorker navigation faults by bypassing the ServiceWorker on # navigation faults. This is more extensive than just resetting interception # because we also mark the page as uncontrolled so that subresources will not # go to the ServiceWorker either. - name: dom.serviceWorkers.mitigations.bypass_on_fault type: bool value: true mirror: always # Additional ServiceWorker navigation mitigation control to unregister the # ServiceWorker after multiple faults are encountered. The mitigation is # disabled when this is set to zero, otherwise this is the number of faults that # need to occur for a specific ServiceWorker before it will be unregistered. - name: dom.serviceWorkers.mitigations.navigation_fault_threshold type: uint32_t value: 3 mirror: always # This is the group usage head room for service workers. # The quota usage mitigation algorithm uses this preference to determine if the # origin or also group data should be cleared or not. # The default value is 400 MiB. - name: dom.serviceWorkers.mitigations.group_usage_headroom_kb type: uint32_t value: 400 * 1024 mirror: always - name: dom.serviceWorkers.testing.enabled type: RelaxedAtomicBool value: false mirror: always # Whether ServiceWorkerManager should persist the service worker # registered by temporary installed extension (only meant to be used # for testing purpose, to make it easier to test some particular scenario # with a temporary installed addon, which doesn't need to be signed to be # installed on release channel builds). - name: dom.serviceWorkers.testing.persistTemporarilyInstalledAddons type: RelaxedAtomicBool value: false mirror: always - name: dom.storage.enabled type: RelaxedAtomicBool value: true mirror: always - name: dom.workers.pFetch.enabled type: RelaxedAtomicBool value: true mirror: always - name: dom.workers.importScripts.enforceStrictMimeType type: RelaxedAtomicBool value: true mirror: always - name: dom.workers.throttling.enabled type: RelaxedAtomicBool value: false mirror: always - name: dom.workers.serialized-sab-access type: RelaxedAtomicBool value: false mirror: always # Enable stronger diagnostics on worker shutdown. # If this is true, we will potentially run an extra GCCC when a worker should # exit its DoRunLoop but holds any WorkerRef and we will MOZ_DIAGNOSTIC_ASSERT # when during that extra GCCC such a WorkerRef is freed. - name: dom.workers.GCCC_on_potentially_last_event type: RelaxedAtomicBool #if defined(FUZZING) || defined(DEBUG) value: true #else value: false #endif mirror: always - name: dom.sitepermsaddon-provider.enabled type: bool value: @IS_NOT_ANDROID@ mirror: always # Server-Sent Events # Equal to the DEFAULT_RECONNECTION_TIME_VALUE value in nsEventSource.cpp - name: dom.serverEvents.defaultReconnectionTime type: RelaxedAtomicUint32 value: 5000 # in milliseconds mirror: always # Whether automatic storage access granting heuristics should be turned on. - name: dom.storage_access.auto_grants type: bool value: true mirror: always - name: dom.storage_access.auto_grants.delayed type: bool value: true mirror: always # Storage-access API. - name: dom.storage_access.enabled type: bool value: true mirror: always # Forward-Declared Storage-access API. - name: dom.storage_access.forward_declared.enabled type: bool value: false mirror: always # How long the Forward-Declared Storage-access API allows between pair requests # in seconds - name: dom.storage_access.forward_declared.lifetime type: uint32_t value: 15 * 60 mirror: always # The maximum number of origins that a given third-party tracker is allowed # to have concurrent access to before the user is presented with a storage # access prompt. Only effective when the auto_grants pref is turned on. - name: dom.storage_access.max_concurrent_auto_grants type: int32_t value: 5 mirror: always - name: dom.storage_access.frame_only type: bool value: true mirror: always # Only grant storage access to secure contexts. - name: dom.storage_access.dont_grant_insecure_contexts type: RelaxedAtomicBool value: true mirror: always # Whether the File System API is enabled - name: dom.fs.enabled type: RelaxedAtomicBool value: true mirror: always # Whether the WritableFileStream is enabled or disabled. - name: dom.fs.writable_file_stream.enabled type: RelaxedAtomicBool value: true mirror: always # A pref that is used to enable testing features. - name: dom.fs.testing type: SequentiallyConsistentAtomicBool value: false mirror: always # A pref that is used to slow down database initialization for testing purposes. - name: dom.fs.databaseInitialization.pauseOnIOThreadMs type: RelaxedAtomicUint32 value: 0 mirror: always # LocalStorage data limit as determined by summing up the lengths of all string # keys and values. This is consistent with the legacy implementation and other # browser engines. This value should really only ever change in unit testing # where being able to lower it makes it easier for us to test certain edge # cases. Measured in KiBs. - name: dom.storage.default_quota type: RelaxedAtomicUint32 # Only allow relatively small amounts of data since performance of the # synchronous IO is very bad. We are enforcing simple per-origin quota only. value: 5 * 1024 mirror: always # Per-site quota for legacy LocalStorage implementation. - name: dom.storage.default_site_quota type: RelaxedAtomicUint32 value: 25 * 1024 mirror: always # Whether or not the unsupported legacy implemenation should be enabled. Please # don't advertise this pref as a way for disabling LSNG. This pref is intended # for internal testing only and will be removed in near future. Accidental # disabling of LSNG can lead to a data loss in a combination with disabled # shadow writes. Disabling of shadow writes is the initial step towards # removing legacy implementation and will be done soon. - name: dom.storage.enable_unsupported_legacy_implementation type: RelaxedAtomicBool value: false mirror: always do_not_use_directly: true # Whether the migration from unsupported legacy implementation is enabled. - name: dom.storage.enable_migration_from_unsupported_legacy_implementation type: RelaxedAtomicBool value: false mirror: always # The amount of snapshot peak usage which is attempted to be pre-incremented # during snapshot creation. - name: dom.storage.snapshot_peak_usage.initial_preincrement type: RelaxedAtomicUint32 value: 16384 mirror: always # The amount of snapshot peak usage which is attempted to be pre-incremented # during snapshot creation if the LocalStorage usage was already close to the # limit (a fallback for dom.storage.snapshot_peak_usage.initial_preincrement). - name: dom.storage.snapshot_peak_usage.reduced_initial_preincrement type: RelaxedAtomicUint32 value: 4096 mirror: always # The amount of snapshot peak usage which is attempted to be pre-incremented # beyond the specific values which are subsequently requested after snapshot # creation. - name: dom.storage.snapshot_peak_usage.gradual_preincrement type: RelaxedAtomicUint32 value: 4096 mirror: always # The amount of snapshot peak usage which is attempted to be pre-incremented # beyond the specific values which are subsequently requested after snapshot # creation if the LocalStorage total usage was already close to the limit # (a fallback for dom.storage.snapshot_peak_usage.gradual_preincrement). - name: dom.storage.snapshot_peak_usage.reduced_gradual_preincrement type: RelaxedAtomicUint32 value: 1024 mirror: always # How long between a snapshot becomes idle and when we actually finish the # snapshot. This preference is only used when "dom.storage.snapshot_reusing" # is true. - name: dom.storage.snapshot_idle_timeout_ms type: uint32_t value: 5000 mirror: always # Is support for Storage test APIs enabled? - name: dom.storage.testing type: SequentiallyConsistentAtomicBool value: false mirror: always # A pref that is used to slow down database initialization for testing purposes. - name: dom.storage.databaseInitialization.pauseOnIOThreadMs type: RelaxedAtomicUint32 value: 0 mirror: always # A pref that is used to slow down request finalization for testing purposes. - name: dom.storage.requestFinalization.pauseOnDOMFileThreadMs type: RelaxedAtomicUint32 value: 0 mirror: always # For area and anchor elements with target=_blank and no rel set to # opener/noopener. - name: dom.targetBlankNoOpener.enabled type: bool value: true mirror: always # Is support for Selection.GetRangesForInterval enabled? - name: dom.testing.selection.GetRangesForInterval type: bool value: false mirror: always - name: dom.testing.structuredclonetester.enabled type: RelaxedAtomicBool value: false mirror: always # To enable TestUtils interface on WPT - name: dom.testing.testutils.enabled type: RelaxedAtomicBool value: false mirror: always - name: dom.text_fragments.enabled type: RelaxedAtomicBool value: true mirror: always rust: true - name: dom.textMetrics.actualBoundingBox.enabled type: RelaxedAtomicBool value: true mirror: always - name: dom.textMetrics.baselines.enabled type: RelaxedAtomicBool value: true mirror: always - name: dom.textMetrics.emHeight.enabled type: RelaxedAtomicBool value: true mirror: always - name: dom.textMetrics.fontBoundingBox.enabled type: RelaxedAtomicBool value: true mirror: always # Time (in ms) that it takes to regenerate 1ms. - name: dom.timeout.background_budget_regeneration_rate type: RelaxedAtomicInt32 value: 100 mirror: always # Time (in ms) that it takes to regenerate 1ms. - name: dom.timeout.foreground_budget_regeneration_rate type: RelaxedAtomicInt32 value: 1 mirror: always # Maximum value (in ms) for the background budget. Only valid for # values greater than 0. - name: dom.timeout.background_throttling_max_budget type: RelaxedAtomicInt32 value: 50 mirror: always # Maximum value (in ms) for the foreground budget. Only valid for # values greater than 0. - name: dom.timeout.foreground_throttling_max_budget type: RelaxedAtomicInt32 value: -1 mirror: always # The maximum amount a timeout can be delayed by budget throttling. - name: dom.timeout.budget_throttling_max_delay type: RelaxedAtomicInt32 value: 15000 mirror: always # Turn on budget throttling by default. - name: dom.timeout.enable_budget_timer_throttling type: RelaxedAtomicBool value: true mirror: always # Should we defer timeouts and intervals while loading a page. Released # on Idle or when the page is loaded. - name: dom.timeout.defer_during_load type: bool value: true mirror: always # Maximum amount of time in milliseconds consecutive setTimeout()/setInterval() # callback are allowed to run before yielding the event loop. - name: dom.timeout.max_consecutive_callbacks_ms type: RelaxedAtomicUint32 value: 4 mirror: always # Maximum deferral time for setTimeout/Interval in milliseconds - name: dom.timeout.max_idle_defer_ms type: uint32_t value: 10*1000 mirror: always # Delay in ms from document load until we start throttling background timeouts. - name: dom.timeout.throttling_delay type: RelaxedAtomicInt32 value: 30000 mirror: always # UDPSocket API - name: dom.udpsocket.enabled type: bool value: false mirror: always # Whether to dump worker use counters - name: dom.use_counters.dump.worker type: RelaxedAtomicBool value: false mirror: always # Whether to dump document use counters - name: dom.use_counters.dump.document type: bool value: false mirror: always # Whether to dump page use counters - name: dom.use_counters.dump.page type: bool value: false mirror: always # Time limit, in milliseconds, for user gesture transient activation. - name: dom.user_activation.transient.timeout type: uint32_t value: 5000 mirror: always # Whether to treat the clicks on scrollbars as user interaction with web content. - name: dom.user_activation.ignore_scrollbars type: bool value: true mirror: always # Whether to shim a Components object on untrusted windows. - name: dom.use_components_shim type: bool value: @IS_NOT_NIGHTLY_BUILD@ mirror: always - name: dom.vibrator.enabled type: bool value: false mirror: always - name: dom.vibrator.max_vibrate_ms type: RelaxedAtomicUint32 value: 10000 mirror: always - name: dom.vibrator.max_vibrate_list_len type: RelaxedAtomicUint32 value: 128 mirror: always # Is support for View Transitions Level 1 enabled? - name: dom.viewTransitions.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # Timeout for view transitions. # TODO(emilio): Figure out the right time-out, Blink uses between 4 and 15 # seconds. - name: dom.viewTransitions.timeout-ms type: uint32_t value: 10000 mirror: always # Is support for WebVR APIs enabled? # Disabled everywhere, but not removed. - name: dom.vr.enabled type: RelaxedAtomicBool value: false mirror: always # Should VR sessions always be reported as supported, without first # checking for VR runtimes? This will prevent permission prompts # from being suppressed on machines without VR runtimes and cause # navigator.xr.isSessionSupported to always report that immersive-vr # is supported. - name: dom.vr.always_support_vr type: RelaxedAtomicBool value: false mirror: always # Should AR sessions always be reported as supported, without first # checking for AR runtimes? This will prevent permission prompts # from being suppressed on machines without AR runtimes and cause # navigator.xr.isSessionSupported to always report that immersive-ar # is supported. - name: dom.vr.always_support_ar type: RelaxedAtomicBool value: false mirror: always # It is often desirable to automatically start vr presentation when # a user puts on the VR headset. This is done by emitting the # Window.vrdisplayactivate event when the headset's sensors detect it # being worn. This can result in WebVR content taking over the headset # when the user is using it outside the browser or inadvertent start of # presentation due to the high sensitivity of the proximity sensor in some # headsets, so it is off by default. - name: dom.vr.autoactivate.enabled type: RelaxedAtomicBool value: false mirror: always # Minimum number of milliseconds that the browser will wait before # attempting to poll again for connected VR controllers. The browser # will not attempt to poll for VR controllers until it needs to use them. - name: dom.vr.controller.enumerate.interval type: RelaxedAtomicInt32 value: 1000 mirror: always # The threshold value of trigger inputs for VR controllers. - name: dom.vr.controller_trigger_threshold type: AtomicFloat value: 0.1f mirror: always # Minimum number of milliseconds that the browser will wait before # attempting to poll again for connected VR displays. The browser # will not attempt to poll for VR displays until it needs to use # them, such as when detecting a WebVR site. - name: dom.vr.display.enumerate.interval type: RelaxedAtomicInt32 value: 5000 mirror: always # The number of milliseconds since last frame start before triggering a new # frame. When content is failing to submit frames on time or the lower level # VR platform APIs are rejecting frames, it determines the rate at which RAF # callbacks will be called. - name: dom.vr.display.rafMaxDuration type: RelaxedAtomicUint32 value: 50 mirror: always # Minimum number of milliseconds the browser will wait before attempting # to re-start the VR service after an enumeration returned no devices. - name: dom.vr.external.notdetected.timeout type: RelaxedAtomicInt32 value: 60000 mirror: always # Minimum number of milliseconds the browser will wait before attempting # to re-start the VR service after a VR API (eg, OpenVR or Oculus) # requests that we shutdown and unload its libraries. # To ensure that we don't interfere with VR runtime software auto-updates, # we will not attempt to re-load the service until this timeout has elapsed. - name: dom.vr.external.quit.timeout type: RelaxedAtomicInt32 value: 10000 mirror: always # Minimum number of milliseconds that the VR session will be kept # alive after the browser and content no longer are using the # hardware. If a VR multitasking environment, this should be set # very low or set to 0. - name: dom.vr.inactive.timeout type: RelaxedAtomicInt32 value: 5000 mirror: always # Maximum number of milliseconds the browser will wait for content to call # VRDisplay.requestPresent after emitting vrdisplayactivate during VR # link traversal. This prevents a long running event handler for # vrdisplayactivate from later calling VRDisplay.requestPresent, which would # result in a non-responsive browser in the VR headset. - name: dom.vr.navigation.timeout type: RelaxedAtomicInt32 value: 5000 mirror: always # Oculus device - name: dom.vr.oculus.enabled type: RelaxedAtomicBool #if defined(HAVE_64BIT_BUILD) && !defined(ANDROID) # We are only enabling WebVR by default on 64-bit builds (Bug 1384459). value: true #else # On Android, this pref is irrelevant. value: false #endif mirror: always # When enabled, Oculus sessions may be created with the ovrInit_Invisible # flag if a page is using tracking but not presenting. When a page # begins presenting VR frames, the session will be re-initialized without # the flag. This eliminates the "Firefox not responding" warnings in # the headset, but might not be compatible with all versions of the Oculus # runtime. - name: dom.vr.oculus.invisible.enabled type: RelaxedAtomicBool value: true mirror: always # Minimum number of milliseconds after content has stopped VR presentation # before the Oculus session is re-initialized to an invisible / tracking # only mode. If this value is too high, users will need to wait longer # after stopping WebVR presentation before automatically returning to the # Oculus home interface. (They can immediately return to the Oculus Home # interface through the Oculus HUD without waiting this duration) # If this value is too low, the Oculus Home interface may be visible # momentarily during VR link navigation. - name: dom.vr.oculus.present.timeout type: RelaxedAtomicInt32 value: 500 mirror: always # OpenVR device - name: dom.vr.openvr.enabled type: RelaxedAtomicBool #if !defined(HAVE_64BIT_BUILD) && !defined(ANDROID) # We are only enabling WebVR by default on 64-bit builds (Bug 1384459). value: false #elif defined(XP_WIN) || defined(XP_MACOSX) # We enable OpenVR by default for Windows and macOS. value: true #else # See Bug 1310663 (Linux). On Android, this pref is irrelevant. value: false #endif mirror: always # OSVR device - name: dom.vr.osvr.enabled type: RelaxedAtomicBool value: false mirror: always # Pose prediction reduces latency effects by returning future predicted HMD # poses to callers of the WebVR API. This currently only has an effect for # Oculus Rift on SDK 0.8 or greater. - name: dom.vr.poseprediction.enabled type: RelaxedAtomicBool value: true mirror: always # Enable a separate process for VR module. - name: dom.vr.process.enabled type: bool #if defined(XP_WIN) value: true #else value: false #endif mirror: once - name: dom.vr.process.startup_timeout_ms type: int32_t value: 5000 mirror: once # Puppet device, used for simulating VR hardware within tests and dev tools. - name: dom.vr.puppet.enabled type: RelaxedAtomicBool value: false mirror: always # Starting VR presentation is only allowed within a user gesture or event such # as VRDisplayActivate triggered by the system. dom.vr.require-gesture allows # this requirement to be disabled for special cases such as during automated # tests or in a headless kiosk system. - name: dom.vr.require-gesture type: RelaxedAtomicBool value: true mirror: always # Is support for WebXR APIs enabled? - name: dom.vr.webxr.enabled type: RelaxedAtomicBool value: false mirror: always # Points in the native bounds geometry are required to be quantized # sufficiently to prevent fingerprinting. The WebXR spec suggests # quantizing to the nearest 5 centimeters. - name: dom.vr.webxr.quantization type: AtomicFloat value: 0.05f mirror: always #ifdef XP_WIN # Control firing WidgetMouseEvent by handling Windows pointer messages or # mouse messages. - name: dom.w3c_pointer_events.dispatch_by_pointer_messages type: bool value: true mirror: always - name: dom.w3c_pointer_events.scroll_by_pen.enabled type: bool value: true mirror: always #endif # If the value is >= 0, it will be used for max touch points in child processes. - name: dom.maxtouchpoints.testing.value type: int32_t value: -1 mirror: always # Maximum value of navigator.hardwareConcurrency. - name: dom.maxHardwareConcurrency type: RelaxedAtomicUint32 #ifdef NIGHTLY_BUILD value: 128 #else value: 16 #endif mirror: always # W3C pointer events draft. - name: dom.w3c_pointer_events.implicit_capture type: bool value: true mirror: always - name: dom.w3c_pointer_events.getcoalescedevents_only_in_securecontext type: bool value: @IS_NIGHTLY_BUILD@ mirror: always # In case Touch API is enabled, this pref controls whether to support # ontouch* event handlers, document.createTouch, document.createTouchList and # document.createEvent("TouchEvent"). - name: dom.w3c_touch_events.legacy_apis.enabled type: bool value: @IS_ANDROID@ mirror: always # W3C touch events # 0 - disabled, 1 - enabled, 2 - autodetect # Autodetection is currently only supported on Windows and GTK3 (and assumed on # Android). - name: dom.w3c_touch_events.enabled type: int32_t #if defined(XP_MACOSX) value: 0 #else value: 2 #endif mirror: always # Is support for the Web Audio API enabled? - name: dom.webaudio.enabled type: bool value: true mirror: always - name: dom.webkitBlink.dirPicker.enabled type: RelaxedAtomicBool value: @IS_NOT_ANDROID@ mirror: always # Whether allowing selection across the boundary # between shadow DOM and light DOM. # This is based on https://github.com/mfreed7/shadow-dom-selection - name: dom.shadowdom.selection_across_boundary.enabled type: bool value: @IS_NIGHTLY_BUILD@ mirror: always # When this pref is enabled: # - Shadow DOM is not pierced by default anymore # - The method accepts optional CaretPositionFromPointOptions to allow piercing # certain ShadowRoots # # https://drafts.csswg.org/cssom-view/#dom-document-caretpositionfrompoint - name: dom.shadowdom.new_caretPositionFromPoint_behavior.enabled type: bool value: @IS_NIGHTLY_BUILD@ mirror: always # NOTE: This preference is used in unit tests. If it is removed or its default # value changes, please update test_sharedMap_static_prefs.js accordingly. - name: dom.webcomponents.shadowdom.report_usage type: bool value: false mirror: always # Is support for Declarative ShadowDOM enabled? - name: dom.webcomponents.shadowdom.declarative.enabled type: bool value: true mirror: always # Is support for the Web GPU API enabled? - name: dom.webgpu.enabled type: RelaxedAtomicBool value: @IS_NIGHTLY_BUILD@ mirror: always # Is support for the Web GPU API enabled on DOM workers? - name: dom.webgpu.workers.enabled type: RelaxedAtomicBool value: false mirror: always # Are WebGPU indirect draws enabled? - name: dom.webgpu.indirect-draw.enabled type: RelaxedAtomicBool value: false mirror: always # Comma-separated list of wgpu backend names to permit in WebGPU adapters. # # If non-empty, this is parsed by `wgpu_core::instance::parse_backends_from_comma_list` to # produce a `wgpu_types::Backends` bitset used to create a `wgpu_core::hub::Global`. As of # 2023-3-22, recognized names are: # # "vulkan" | "vk" => Backends::VULKAN, # "dx12" | "d3d12" => Backends::DX12, # "dx11" | "d3d11" => Backends::DX11, # "metal" | "mtl" => Backends::METAL, # "opengl" | "gles" | "gl" => Backends::GL, # "webgpu" => Backends::BROWSER_WEBGPU, - name: dom.webgpu.wgpu-backend type: DataMutexString value: "" mirror: always rust: true - name: dom.webgpu.allow-present-without-readback type: RelaxedAtomicBool #if defined(XP_WIN) value: true #else value: false #endif mirror: always # For testing purposes, crash if we don't get a hardware adapter. - name: dom.webgpu.testing.assert-hardware-adapter type: RelaxedAtomicBool value: false mirror: always rust: true # Whether to pass labels to the hardware abstraction layer. This is only useful when # inspecting a WebGPU workload in a GPU debugging tool like renderdoc. Enabling it # exposes poorly tested driver API surfaces so it should not be enabled by default. - name: dom.webgpu.hal-labels type: bool value: false mirror: once rust: true # Is support for HTMLInputElement.webkitEntries enabled? - name: dom.webkitBlink.filesystem.enabled type: bool value: @IS_NOT_ANDROID@ mirror: always # Whether the WebMIDI API is enabled - name: dom.webmidi.enabled type: bool value: @IS_NOT_ANDROID@ mirror: always # midi permission is addon-gated - name: dom.webmidi.gated type: bool value: true mirror: always - name: dom.webnotifications.allowcrossoriginiframe type: RelaxedAtomicBool value: false mirror: always - name: dom.webnotifications.enabled type: RelaxedAtomicBool value: true mirror: always - name: dom.webnotifications.privateBrowsing.enabled type: RelaxedAtomicBool value: true mirror: always - name: dom.webnotifications.requireuserinteraction type: RelaxedAtomicBool value: true mirror: always - name: dom.webnotifications.requireinteraction.enabled type: RelaxedAtomicBool #if defined(XP_WIN) value: true #else value: @IS_NIGHTLY_BUILD@ #endif mirror: always - name: dom.webnotifications.silent.enabled type: RelaxedAtomicBool value: true mirror: always - name: dom.webnotifications.vibrate.enabled type: RelaxedAtomicBool value: false mirror: always # Setting log level for notification modules. # The value follows the enum ConsoleLogLevel in ConsoleInstance.webidl. - name: dom.webnotifications.loglevel type: String value: Error mirror: never - name: dom.worker.canceling.timeoutMilliseconds type: RelaxedAtomicUint32 value: 30000 # 30 seconds mirror: always # Enables the dispatching of console log events from worker threads to the # main-thread. - name: dom.worker.console.dispatch_events_to_main_thread type: RelaxedAtomicBool value: true mirror: always - name: dom.workers.testing.enabled type: RelaxedAtomicBool value: false mirror: always # WebIDL test prefs. - name: dom.webidl.test1 type: bool value: true mirror: always - name: dom.webidl.test2 type: bool value: true mirror: always # WebShare API - exposes navigator.share() - name: dom.webshare.enabled type: bool #ifdef XP_WIN value: @IS_EARLY_BETA_OR_EARLIER@ #else value: false #endif mirror: always # WebShare API - allows WebShare without user interaction (for tests only). - name: dom.webshare.requireinteraction type: bool value: true mirror: always # Hide the confirm dialog when a POST request is reloaded. - name: dom.confirm_repost.testing.always_accept type: bool value: false mirror: always # Whether we should suspend inactive tabs or not - name: dom.suspend_inactive.enabled type: bool value: @IS_ANDROID@ mirror: always # The following three prefs control the maximum script run time before slow # script warning. # Controls the time that a content script can run before showing a # notification. - name: dom.max_script_run_time type: int32_t value: 10 mirror: always # Controls whether we want to wait for user input before surfacing notifying # the parent process about a long-running script. - name: dom.max_script_run_time.require_critical_input type: bool # On desktop, we don't want to annoy the user with a notification if they're # not interacting with the browser. On Android however, we automatically # terminate long-running scripts, so we want to make sure we don't get in the # way of that by waiting for input. #if defined(MOZ_WIDGET_ANDROID) value: false #else value: true #endif mirror: always # Controls if a content script will be aborted on child process shutdown. - name: dom.abort_script_on_child_shutdown type: bool value: true mirror: always - name: dom.max_chrome_script_run_time type: int32_t value: 0 mirror: always - name: dom.max_ext_content_script_run_time type: int32_t value: 5 mirror: always # Let Resize Observer report the size of all fragments, and not just the # first one, as per CSSWG resolution: # https://github.com/w3c/csswg-drafts/issues/3673#issuecomment-467221565 - name: dom.resize_observer.support_fragments type: bool value: false mirror: always # Whether allowing using to move focus to root elements - name: dom.disable_tab_focus_to_root_element type: bool value: true mirror: always #--------------------------------------------------------------------------- # Prefs starting with "editor" #--------------------------------------------------------------------------- # Default background color of HTML editor. This is referred only when # "editor.use_custom_colors" is set to `true`. - name: editor.background_color type: String value: "#FFFFFF" mirror: never # Delay to mask last input character in password fields. # If negative value, to use platform's default behavior. # If 0, no delay to mask password. # Otherwise, password fields unmask last input character(s) during specified # time (in milliseconds). - name: editor.password.mask_delay type: int32_t value: -1 mirror: always # Set to true when you test mask_delay of password editor. If this is set # to true, "MozLastInputMasked" is fired when last input characters are # masked by timeout. - name: editor.password.testing.mask_delay type: bool value: false mirror: always # How line breakers are treated in single line editor: # * 0: Only remove the leading and trailing newlines. # * 1: Remove the first newline and all characters following it. # * 2: Replace newlines with spaces (default of Firefox). # * 3: Remove newlines from the string. # * 4: Replace newlines with commas (default of Thunderbird). # * 5: Collapse newlines and surrounding white space characters and # remove them from the string. # Other values are treated as 1. - name: editor.singleLine.pasteNewlines type: int32_t value: 2 mirror: always # Whether user pastes should be truncated. - name: editor.truncate_user_pastes type: bool value: true mirror: always # When this is set to `true`, "editor.background_color" must be set, then, # the value is treated as default background color of the HTML editor. # If `false` and "browser.display.use_system_colors" is set to `true`, # "browser.display.background_color" is used instead. # Otherwise, no color is used as default background color. # This pref is for Thunderbird and SeaMonkey. - name: editor.use_custom_colors type: bool value: false mirror: always # If this is set to `true`, CSS mode of style editor is enabled by default # unless it's a mail editor. # This pref is for Thunderbird and SeaMonkey. - name: editor.use_css type: bool value: false mirror: always # Whether enabling blink compatible white-space normalizer or keep using # Gecko's traditional white-space normalizer. - name: editor.white_space_normalization.blink_compatible type: bool value: false mirror: always # General prefs for editor, indicating whether Gecko-specific editing UI is # enabled by default. Those UIs are not implemented by any other browsers. So, # only Firefox users can change some styles with them. This means that Firefox # users may get unexpected result of some web apps if they assume that users # cannot change such styles. - name: editor.resizing.enabled_by_default type: bool value: false mirror: always - name: editor.inline_table_editing.enabled_by_default type: bool value: false mirror: always - name: editor.positioning.enabled_by_default type: bool value: false mirror: always # Controls if a double click word selection also deletes one adjacent whitespace # (if feasible). This mimics native behaviour on MacOS. - name: editor.word_select.delete_space_after_doubleclick_selection type: bool #ifdef XP_MACOSX value: true #else value: false #endif mirror: always #--------------------------------------------------------------------------- # Prefs starting with "extensions." #--------------------------------------------------------------------------- # Pref that enforces the use of web_accessible_resources for content loads. # This behavior is default for MV3. The pref controls this for MV2. - name: extensions.content_web_accessible.enabled type: bool value: false mirror: always # Whether the InstallTrigger implementation should be enabled (or hidden and # none of its methods available). - name: extensions.InstallTriggerImpl.enabled type: bool value: false mirror: always # Whether the InstallTrigger implementation should be enabled (or completely # hidden), separate from InstallTriggerImpl because InstallTrigger is improperly # used also for UA detection. - name: extensions.InstallTrigger.enabled type: bool value: @IS_NOT_EARLY_BETA_OR_EARLIER@ mirror: always # Whether the background.service_worker in the extension manifest.json file # is enabled. # all.js locks the pref to false when MOZ_WEBEXT_WEBIDL_ENABLED is false. - name: extensions.backgroundServiceWorker.enabled type: bool value: false mirror: once # Maximum number of misspelled words in a text. - name: extensions.spellcheck.inline.max-misspellings type: int32_t value: 500 mirror: always # Whether the extensions can register a service worker on its own. # NOTE: WebExtensions Framework ability to register a background service worker # is not controlled by this pref, only the extension code ability to use # navigator.serviceWorker.register is locked behind this pref. - name: extensions.serviceWorkerRegister.allowed type: RelaxedAtomicBool value: false mirror: always # When true, content scripts of MV2 extensions can run in blob:-documents without # requiring match_origin_as_fallback to be set, to revert bug 1897113. # TODO bug 1899134: Remove this pref. - name: extensions.script_blob_without_match_origin_as_fallback type: bool value: false mirror: always # Legacy behavior on filterResponse calls on intercepted sw script requests. - name: extensions.filterResponseServiceWorkerScript.disabled type: bool value: false mirror: always # This pref governs whether we run webextensions in a separate process (true) # or the parent/main process (false) - name: extensions.webextensions.remote type: RelaxedAtomicBool value: false mirror: always # Whether to expose the MockExtensionAPI test interface in tests. # The interface MockExtensionAPI doesn't represent a real extension API, # it is only available in test and does include a series of cases useful # to test the API request handling without tying the unit test to a # specific WebExtensions API. - name: extensions.webidl-api.expose_mock_interface type: RelaxedAtomicBool value: false mirror: always # Whether to allow acccess to AddonManager to developer sites for testing # NOTE: We'd like this to be a "hidden" pref once StaticPrefs supports it. - name: extensions.webapi.testing type: RelaxedAtomicBool value: false mirror: always # Automation-only pref to allow AddonManager over insecure protocols. # NOTE: We'd like this to be a "hidden" pref once StaticPrefs supports it. - name: extensions.webapi.testing.http type: RelaxedAtomicBool value: false mirror: always # Whether to expose the AddonManager web API. - name: extensions.webapi.enabled type: RelaxedAtomicBool value: @IS_NOT_ANDROID@ mirror: always #--------------------------------------------------------------------------- # Prefs starting with "fission." #--------------------------------------------------------------------------- # Whether to enable Fission in new windows by default. # IMPORTANT: This preference should *never* be checked directly, since any # session can contain a mix of Fission and non-Fission windows. Instead, # callers should check whether the relevant nsILoadContext has the # `useRemoteSubframes` flag set. # Callers which cannot use `useRemoteSubframes` must use # `Services.appinfo.fissionAutostart` or `mozilla::FissionAutostart()` to check # whether fission is enabled by default. - name: fission.autostart type: bool value: @IS_NOT_ANDROID@ mirror: never # Disable storing the session history in the parent process, and accessing it # over IPC from the child processes. - name: fission.disableSessionHistoryInParent type: bool value: @IS_ANDROID@ mirror: once do_not_use_directly: true # If session history is stored in the parent process, enable bfcache for it. - name: fission.bfcacheInParent type: bool value: true mirror: always do_not_use_directly: true # Allow renaming of processes from Private Windows to the eTLD+1 on nightly # Setting this pref creates a privacy leak, but helps greatly with # debugging. - name: fission.processPrivateWindowSiteNames type: bool value: false mirror: always # Allow renaming of process names to the eTLD+1 on all versions, NOT # including processes from Private Windows # Setting this pref creates a privacy leak, but helps greatly with # debugging - name: fission.processSiteNames type: bool value: false mirror: always # Allow showing of current profile along with process names, NOT # including processes from Private Windows # Setting this pref creates a privacy leak, but helps greatly with # debugging - name: fission.processProfileName type: bool value: false mirror: always # The strategy used to control how sites are isolated into separate processes # when Fisison is enabled. This pref has no effect if Fission is disabled. # See the `WebContentIsolationStrategy` enum in `ProcessIsolation.cpp`. - name: fission.webContentIsolationStrategy type: uint32_t value: 1 mirror: always # Time in seconds before a site loaded with the Cross-Origin-Opener-Policy # header is no longer considered high-value and isolated in the "highValueCOOP" # configuration. - name: fission.highValue.coop.expiration type: uint32_t value: 2592000 # 30 days (in seconds) mirror: always # Time in seconds before a site are considered high-value by the login detection # service is no longer considered high-value and isolated in the "highValueHasSavedLogin" # or "highValueIsLoggedIn" configuration. - name: fission.highValue.login.expiration type: uint32_t value: 2592000 # 30 days (in seconds) mirror: always # If true, capture login attemp, and add "highValueIsLoggedIn" permission to # the permission manager no matter whether fission is enabled and # WebContentIsolationStrateg is set to IsolateHighvalue. - name: fission.highValue.login.monitor type: bool value: @IS_ANDROID@ mirror: always # If true, do not send blocklisted preference values to the subprocess - name: fission.omitBlocklistedPrefsInSubprocesses type: RelaxedAtomicBool value: true mirror: always # If true, crash when a blocklisted preference is accessed in a subprocess - name: fission.enforceBlocklistedPrefsInSubprocesses type: RelaxedAtomicBool #ifdef DEBUG value: true #else value: false #endif mirror: always #--------------------------------------------------------------------------- # Prefs starting with "font." #--------------------------------------------------------------------------- # A value greater than zero enables font size inflation for # pan-and-zoom UIs, so that the fonts in a block are at least the size # that, if a block's width is scaled to match the device's width, the # fonts in the block are big enough that at most the pref value ems of # text fit in *the width of the device*. # # When both this pref and the next are set, the larger inflation is used. - name: font.size.inflation.emPerLine type: uint32_t value: 0 mirror: always # A value greater than zero enables font size inflation for # pan-and-zoom UIs, so that if a block's width is scaled to match the # device's width, the fonts in a block are at least the given font size. # The value given is in twips, i.e., 1/20 of a point, or 1/1440 of an inch. # # When both this pref and the previous are set, the larger inflation is used. - name: font.size.inflation.minTwips type: uint32_t value: 0 mirror: always # In products with multi-mode pan-and-zoom and non-pan-and-zoom UIs, # this pref forces font inflation to always be enabled in all modes. # That is, any heuristics used to detect pan-and-zoom # vs. non-pan-and-zoom modes are disabled and all content is treated # as pan-and-zoom mode wrt font inflation. # # This pref has no effect if font inflation is not enabled through # either of the prefs above. It has no meaning in single-mode UIs. - name: font.size.inflation.forceEnabled type: bool value: false mirror: always # In products with multi-mode pan-and-zoom and non-pan-and-zoom UIs, # this pref disables font inflation in master-process contexts where # existing heuristics can't be used determine enabled-ness. # # This pref has no effect if font inflation is not enabled through # either of the prefs above. The "forceEnabled" pref above overrides # this pref. - name: font.size.inflation.disabledInMasterProcess type: bool value: false mirror: always # Defines the font size inflation mapping intercept parameter. # # Font size inflation computes a minimum font size, m, based on # other preferences (see font.size.inflation.minTwips and # font.size.inflation.emPerLine, above) and the width of the # frame in which the text resides. Using this minimum, a specified # font size, s, is mapped to an inflated font size, i, using an # equation that varies depending on the value of the font size # inflation mapping intercept parameter, P. # # If the intercept parameter is negative, then the following mapping # function is used: # # i = m + s # # If the intercept parameter is non-negative, then the mapping function # is a function such that its graph meets the graph of i = s at the # point where both i and s are (1 + P/2) * m for values of s that are # large enough. This means that when s=0, i is always equal to m. - name: font.size.inflation.mappingIntercept type: int32_t value: 1 mirror: always # Since the goal of font size inflation is to avoid having to # repeatedly scroll side to side to read a block of text, and there are # a number of page layouts where a relatively small chunk of text is # better off not being inflated according to the same algorithm we use # for larger chunks of text, we want a threshold for an amount of text # that triggers font size inflation. This preference controls that # threshold. # # It controls the threshold used within an *approximation* of the # number of lines of text we use. In particular, if we assume that # each character (collapsing collapsible whitespace) has a width the # same as the em-size of the font (when, normally, it's actually quite # a bit smaller on average), this preference gives the percentage of a # number of lines of text we'd need to trigger inflation. This means # that a percentage of 100 means that we'd need a number of characters # (we know the font size and the width) equivalent to one line of # square text (which is actually a lot less than a real line of text). # # A value of 0 means there's no character length threshold. - name: font.size.inflation.lineThreshold type: uint32_t value: 400 mirror: always # This controls the percentage that fonts will be inflated, if font # size inflation is enabled. Essentially, if we have a specified font # size, s, and an inflated font size, i, this specifies that the ratio # i/s * 100 should never exceed the value of this preference. In order # for this preference to have any effect, its value must be greater # than 100, since font inflation can never decrease the ratio i/s. - name: font.size.inflation.maxRatio type: uint32_t value: 0 mirror: always #--------------------------------------------------------------------------- # Prefs starting with "full-screen-api." #--------------------------------------------------------------------------- - name: full-screen-api.enabled type: bool value: true mirror: always - name: full-screen-api.allow-trusted-requests-only type: bool value: true mirror: always - name: full-screen-api.mouse-event-allow-left-button-only type: bool value: true mirror: always - name: full-screen-api.exit-on.windowOpen type: bool value: true mirror: always - name: full-screen-api.exit-on.windowRaise type: bool value: true mirror: always - name: full-screen-api.pointer-lock.enabled type: bool value: true mirror: always # whether to prevent the top level widget from going fullscreen - name: full-screen-api.ignore-widgets type: bool value: false mirror: always #--------------------------------------------------------------------------- # Prefs starting with "fuzzing.". It's important that these can only be # checked in fuzzing builds (when FUZZING is defined), otherwise you could # enable the fuzzing stuff on your regular build which would be bad :) #--------------------------------------------------------------------------- #ifdef FUZZING - name: fuzzing.enabled type: bool #ifdef FUZZING_SNAPSHOT value: true #else value: false #endif mirror: always - name: fuzzing.necko.enabled type: RelaxedAtomicBool value: false mirror: always - name: fuzzing.necko.http3 type: RelaxedAtomicBool value: false mirror: always rust: true # This configures a virtual authenticator for WebAuthn. The value encodes the # arguments to the WebDriver "Add Virtual Authenticator" extension command. # Bits 0, 1, 2, and 3 encode "is_user_verified", "is_user_consenting", # "has_user_verification", and "has_resident_key" in that order. Bit 5 encodes # the transport, either "usb" (0) or "internal" (1). Bits 6 and 7 encode the # protocol, either "ctap1/u2f" (1), "ctap2" (2), or "ctap2_1" (3). Note that # the valid protocol values are non-zero---an authenticator will not be # configured if this pref is set to zero. Changing this pref requires # a restart. - name: fuzzing.webauthn.authenticator_config type: RelaxedAtomicUint32 value: 0 mirror: always rust: true #endif #--------------------------------------------------------------------------- # Prefs starting with "general." #--------------------------------------------------------------------------- - name: general.aboutConfig.enable type: bool value: true mirror: always # Limits the depth of recursive conversion of data when opening # a content to view. This is mostly intended to prevent infinite # loops with faulty converters involved. - name: general.document_open_conversion_depth_limit type: uint32_t value: 20 mirror: always - name: general.smoothScroll type: RelaxedAtomicBool value: true mirror: always # This pref and general.smoothScroll.stopDecelerationWeighting determine # the timing function. - name: general.smoothScroll.currentVelocityWeighting type: AtomicFloat value: 0.25 mirror: always # To connect consecutive scroll events into a continuous flow, the animation's # duration should be longer than scroll events intervals (or else the scroll # will stop before the next event arrives - we're guessing the next interval # by averaging recent intervals). # This defines how much longer the duration is compared to the events # interval (percentage). - name: general.smoothScroll.durationToIntervalRatio type: RelaxedAtomicInt32 value: 200 mirror: always - name: general.smoothScroll.lines type: RelaxedAtomicBool value: true mirror: always - name: general.smoothScroll.lines.durationMaxMS type: RelaxedAtomicInt32 value: 150 mirror: always - name: general.smoothScroll.lines.durationMinMS type: RelaxedAtomicInt32 value: 150 mirror: always - name: general.smoothScroll.mouseWheel type: RelaxedAtomicBool value: true mirror: always - name: general.smoothScroll.mouseWheel.durationMaxMS type: RelaxedAtomicInt32 value: 200 mirror: always - name: general.smoothScroll.mouseWheel.durationMinMS type: RelaxedAtomicInt32 value: 50 mirror: always - name: general.smoothScroll.other type: RelaxedAtomicBool value: true mirror: always - name: general.smoothScroll.other.durationMaxMS type: RelaxedAtomicInt32 value: 150 mirror: always - name: general.smoothScroll.other.durationMinMS type: RelaxedAtomicInt32 value: 150 mirror: always - name: general.smoothScroll.pages type: RelaxedAtomicBool value: true mirror: always - name: general.smoothScroll.pages.durationMaxMS type: RelaxedAtomicInt32 value: 150 mirror: always - name: general.smoothScroll.pages.durationMinMS type: RelaxedAtomicInt32 value: 150 mirror: always - name: general.smoothScroll.scrollbars type: RelaxedAtomicBool value: true mirror: always - name: general.smoothScroll.scrollbars.durationMaxMS type: RelaxedAtomicInt32 value: 150 mirror: always - name: general.smoothScroll.scrollbars.durationMinMS type: RelaxedAtomicInt32 value: 150 mirror: always - name: general.smoothScroll.pixels type: RelaxedAtomicBool value: true mirror: always - name: general.smoothScroll.pixels.durationMaxMS type: RelaxedAtomicInt32 value: 150 mirror: always - name: general.smoothScroll.pixels.durationMinMS type: RelaxedAtomicInt32 value: 150 mirror: always # This pref and general.smoothScroll.currentVelocityWeighting determine # the timing function. - name: general.smoothScroll.stopDecelerationWeighting type: AtomicFloat value: 0.4f mirror: always # Alternative smooth scroll physics. ("MSD" = Mass-Spring-Damper) - name: general.smoothScroll.msdPhysics.enabled type: RelaxedAtomicBool value: @IS_NIGHTLY_BUILD@ mirror: always - name: general.smoothScroll.msdPhysics.continuousMotionMaxDeltaMS type: RelaxedAtomicInt32 value: 120 mirror: always - name: general.smoothScroll.msdPhysics.motionBeginSpringConstant type: RelaxedAtomicInt32 value: 1250 mirror: always - name: general.smoothScroll.msdPhysics.slowdownMinDeltaMS type: RelaxedAtomicInt32 value: 12 mirror: always - name: general.smoothScroll.msdPhysics.slowdownMinDeltaRatio type: AtomicFloat value: 1.3f mirror: always - name: general.smoothScroll.msdPhysics.slowdownSpringConstant type: RelaxedAtomicInt32 value: 2000 mirror: always - name: general.smoothScroll.msdPhysics.regularSpringConstant type: RelaxedAtomicInt32 value: 1000 mirror: always #--------------------------------------------------------------------------- # Prefs starting with "geo." #--------------------------------------------------------------------------- # Is support for Navigator.geolocation enabled? - name: geo.enabled type: bool value: true mirror: always # Time, in milliseconds, to wait for the location provider to spin up. - name: geo.timeout type: int32_t value: 6000 mirror: always #ifdef MOZ_ENABLE_DBUS # Whether to use Geoclue location provider (if available on the system). - name: geo.provider.use_geoclue type: bool value: true mirror: always # Whether to always provide high location accuracy, even if site # doesn't actually request this level of accuracy. # Almost no site correctly requests high accuracy so force it by default # for compatibility with other geolocation providers. - name: geo.provider.geoclue.always_high_accuracy type: bool value: true mirror: always # Time in milliseconds after which geoclue will try to fallback to MLS if no # location is received after successful start. - name: geo.provider.geoclue.mls_fallback_timeout_ms type: uint32_t value: 5000 mirror: always #endif # If true, open system preferences for the user when geolocation is requested # by the user but OS geolocation permission is not available. - name: geo.prompt.open_system_prefs type: bool value: true mirror: always #--------------------------------------------------------------------------- # Prefs starting with "gfx." #--------------------------------------------------------------------------- # Allow 24-bit colour when the hardware supports it. - name: gfx.android.rgb16.force type: bool value: false mirror: once - name: gfx.apitrace.enabled type: bool value: false mirror: once - name: gfx.blithelper.precision type: RelaxedAtomicUint32 value: 2 # { 0: lowp, 1: mediump, 2: highp } mirror: always - name: gfx.blithelper.lut-size.rgb.b type: RelaxedAtomicUint32 value: 15 mirror: always - name: gfx.blithelper.lut-size.rgb.g type: RelaxedAtomicUint32 value: 31 mirror: always - name: gfx.blithelper.lut-size.rgb.r type: RelaxedAtomicUint32 value: 31 mirror: always - name: gfx.blithelper.lut-size.ycbcr.cb type: RelaxedAtomicUint32 value: 15 mirror: always - name: gfx.blithelper.lut-size.ycbcr.cr type: RelaxedAtomicUint32 value: 31 mirror: always - name: gfx.blithelper.lut-size.ycbcr.y type: RelaxedAtomicUint32 value: 31 mirror: always # Nb: we ignore this pref on release and beta. - name: gfx.blocklist.all type: int32_t value: 0 mirror: once #if defined(XP_DARWIN) - name: gfx.cairo_quartz_cg_layer.enabled type: bool value: true mirror: always #endif - name: gfx.canvas.accelerated type: bool #if defined(XP_MACOSX) || defined(XP_LINUX) && !defined(ANDROID) value: true #elif defined(MOZ_WIDGET_ANDROID) value: true #elif defined(XP_WIN) value: true #else value: false #endif mirror: always # Whether to attempt to enable Accelerated Canvas2D regardless of blocklisting. - name: gfx.canvas.accelerated.force-enabled type: bool value: false mirror: always - name: gfx.canvas.accelerated.async-present type: RelaxedAtomicBool value: true mirror: always - name: gfx.canvas.accelerated.cache-items type: RelaxedAtomicUint32 value: 8192 mirror: always - name: gfx.canvas.accelerated.cache-size type: RelaxedAtomicUint32 value: 256 mirror: always - name: gfx.canvas.accelerated.reserve-empty-cache type: RelaxedAtomicUint32 value: 36 mirror: always - name: gfx.canvas.accelerated.max-draw-target-count type: RelaxedAtomicUint32 value: 200 mirror: always - name: gfx.canvas.accelerated.max-size type: RelaxedAtomicInt32 value: 8192 mirror: always - name: gfx.canvas.accelerated.min-size type: RelaxedAtomicInt32 value: 128 mirror: always - name: gfx.canvas.accelerated.max-surface-size type: RelaxedAtomicUint32 value: 5280 mirror: always - name: gfx.canvas.accelerated.shared-page-size type: RelaxedAtomicUint32 value: 1024 mirror: always # The minimum number of frames before acting on performance profile info - name: gfx.canvas.accelerated.profile-frames type: RelaxedAtomicUint32 value: 10 mirror: always # The ratio of failed frames to total frames when to fall back from acceleration - name: gfx.canvas.accelerated.profile-fallback-ratio type: AtomicFloat value: 0.3 mirror: always # The ratio of cache misses at which to fail a profile frame - name: gfx.canvas.accelerated.profile-cache-miss-ratio type: AtomicFloat value: 0.66 mirror: always # The maximum size of the GPU path cache in MB. - name: gfx.canvas.accelerated.gpu-path-size type: RelaxedAtomicUint32 value: 4 mirror: always # The maximum allowed complexity of a GPU path. - name: gfx.canvas.accelerated.gpu-path-complexity type: RelaxedAtomicUint32 value: 4000 mirror: always # Whether to accelerate stroked paths by converting them to fill paths. - name: gfx.canvas.accelerated.stroke-to-fill-path type: RelaxedAtomicBool value: false mirror: always # Whether to use aa-stroke to accelerate stroked paths. - name: gfx.canvas.accelerated.aa-stroke.enabled type: RelaxedAtomicBool value: true mirror: always # Draws an indicator if acceleration is used. - name: gfx.canvas.accelerated.debug type: RelaxedAtomicBool value: false mirror: always # 0x7fff is the maximum supported xlib surface size and is more than enough for canvases. - name: gfx.canvas.max-size type: RelaxedAtomicInt32 value: 0x7fff mirror: always - name: gfx.canvas.remote type: bool #if defined(XP_WIN) value: true #else value: false #endif mirror: once - name: gfx.canvas.remote.allow-in-parent type: bool value: false mirror: once # Whether OffscreenCanvas can use remote canvas - name: gfx.canvas.remote.allow-offscreen type: RelaxedAtomicBool value: true mirror: always # How many worker threads spawned for remote canvas # -1 - Calculate based on processor cores # 0 - No worker threads spawned, will do work on CanvasRenderThread # >0 - Create worker thread pool with given size - name: gfx.canvas.remote.worker-threads type: int32_t #if defined(XP_WIN) value: -1 #else value: 0 #endif mirror: once # Default size of the shmem buffers used for recording - name: gfx.canvas.remote.default-buffer-size type: RelaxedAtomicUint32 value: 32 * 1024 mirror: always # Maximum number of Default size shmem buffers to use - name: gfx.canvas.remote.max_default_buffers type: RelaxedAtomicUint32 value: 256 mirror: always # How many times to spin before waiting in remote canvas - name: gfx.canvas.remote.max-spin-count type: RelaxedAtomicUint32 value: 500 mirror: always # How long to wait in milliseconds for the next event while in a transaction - name: gfx.canvas.remote.event-timeout-ms type: RelaxedAtomicUint32 value: 2 mirror: always # How many times we have a spare buffer before we drop one - name: gfx.canvas.remote.drop-buffer-limit type: RelaxedAtomicUint32 value: 100 mirror: always # Delay in milliseconds to drop buffers when there have been no non-empty transactions - name: gfx.canvas.remote.drop-buffer-milliseconds type: RelaxedAtomicUint32 value: 10000 mirror: always - name: gfx.canvas.remote.use-draw-image-fast-path type: RelaxedAtomicBool value: true mirror: always - name: gfx.canvas.remote.use-draw-image-fast-path-d3d type: RelaxedAtomicBool value: false mirror: always - name: gfx.canvas.remote.recycle-used-data-surface type: RelaxedAtomicBool value: true mirror: always - name: gfx.canvas.remote.use-canvas-translator-event type: bool value: true mirror: once - name: gfx.canvas.willreadfrequently.enabled type: bool #if defined(XP_WIN) value: false #else value: true #endif mirror: once - name: gfx.color_management.display_profile type: DataMutexString value: "" mirror: always # But be warned: We cache the result. - name: gfx.color_management.force_srgb type: RelaxedAtomicBool value: false mirror: always - name: gfx.color_management.native_srgb type: RelaxedAtomicBool #if defined(XP_MACOSX) value: true #else value: false #endif mirror: always - name: gfx.color_management.enablev4 type: RelaxedAtomicBool value: true mirror: always # 0 = Off, 1 = Full, 2 = Tagged Images Only. # See CMSMode in gfx/thebes/gfxPlatform.h. - name: gfx.color_management.mode type: RelaxedAtomicInt32 value: 2 mirror: always # The zero default here should match QCMS_INTENT_DEFAULT from qcms.h - name: gfx.color_management.rendering_intent type: RelaxedAtomicInt32 value: 0 mirror: always - name: gfx.color_management.rec709_gamma_as_srgb type: RelaxedAtomicBool value: true # Tragic backwards compat. mirror: always - name: gfx.color_management.rec2020_gamma_as_rec709 type: RelaxedAtomicBool value: true # Match naive behavior, but hopefully we can stop soon! mirror: always # Whether GL contexts can be migrated to a different GPU (to match the one the # OS is using for composition). # # 0 = force disable migration # 1 = use migration where in safe configurations (the default) # 2 = force enable migration (for testing) - name: gfx.compositor.gpu-migration type: RelaxedAtomicInt32 value: 1 mirror: always - name: gfx.core-animation.tint-opaque type: RelaxedAtomicBool value: false mirror: always #ifdef XP_DARWIN # Create specialized video-only layers for video content in # fullscreen windows. Consistently works well on Apple Silicon, # some issues remain on Intel hardware. - name: gfx.core-animation.specialize-video type: RelaxedAtomicBool #if defined(MOZ_AARCH64) value: true #else value: false #endif mirror: always #endif #if defined(XP_DARWIN) && defined(NIGHTLY_BUILD) # Spoof the timing of the video sample instead of marking the untimed # sample to be displayed immediately. - name: gfx.core-animation.specialize-video.spoof-timing type: RelaxedAtomicBool value: false mirror: always # Check that the sample has a color space and if it doesn't, log that # and supply the default color space from the main display. - name: gfx.core-animation.specialize-video.check-color-space type: RelaxedAtomicBool value: false mirror: always # Log properties of the video surface, buffer, and format. - name: gfx.core-animation.specialize-video.log type: RelaxedAtomicBool value: false mirror: always #endif #ifdef XP_DARWIN - name: gfx.core-animation.low-power-telemetry-frames type: int32_t value: 600 mirror: once #endif #if defined(MOZ_WIDGET_ANDROID) # Overrides the glClear color used when the surface origin is not (0, 0) # Used for drawing a border around the content. - name: gfx.compositor.override.clear-color.r type: AtomicFloat value: 0.0f mirror: always - name: gfx.compositor.override.clear-color.g type: AtomicFloat value: 0.0f mirror: always - name: gfx.compositor.override.clear-color.b type: AtomicFloat value: 0.0f mirror: always - name: gfx.compositor.override.clear-color.a type: AtomicFloat value: 0.0f mirror: always #endif # defined(MOZ_WIDGET_ANDROID) - name: gfx.content.always-paint type: RelaxedAtomicBool value: false mirror: always # Size in megabytes - name: gfx.content.skia-font-cache-size type: int32_t value: 5 mirror: once - name: gfx.device-reset.limit type: int32_t value: 10 mirror: once - name: gfx.device-reset.threshold-ms type: int32_t value: -1 mirror: once # Whether to disable the automatic detection and use of direct2d. - name: gfx.direct2d.disabled type: bool value: true mirror: once # Whether to attempt to enable Direct2D regardless of automatic detection or # blacklisting. - name: gfx.direct2d.force-enabled type: bool value: false mirror: once - name: gfx.direct2d.target-independent-rasterization.disabled type: bool value: false mirror: once - name: gfx.direct3d11.reuse-decoder-device type: bool value: true mirror: once # Enable reuse decoder device even when it is blocked. - name: gfx.direct3d11.reuse-decoder-device-force-enabled type: bool value: false mirror: once - name: gfx.direct3d11.allow-keyed-mutex type: RelaxedAtomicBool value: true mirror: always - name: gfx.direct3d11.use-double-buffering type: RelaxedAtomicBool value: false mirror: always - name: gfx.direct3d11.enable-debug-layer type: bool value: false mirror: once - name: gfx.direct3d11.break-on-error type: bool value: false mirror: once - name: gfx.direct3d11.sleep-on-create-device type: int32_t value: 0 mirror: once # Rate by which the frame rate is divided. I.e. at a number higher than 1 we # will only refresh every frames. - name: gfx.display.frame-rate-divisor type: RelaxedAtomicInt32 value: 1 mirror: always - name: gfx.display.max-frame-rate type: RelaxedAtomicInt32 value: 0 mirror: always # Whether to disable downloadable font cache so that behavior is consistently # the uncached load behavior across pages (useful for testing reflow problems) - name: gfx.downloadable_fonts.disable_cache type: RelaxedAtomicBool value: false mirror: always # Whether to preserve color bitmap tables in fonts (bypassing OTS). # Currently these are supported only on platforms where we use Freetype # to render fonts (Linux/Gtk and Android). - name: gfx.downloadable_fonts.keep_color_bitmaps type: RelaxedAtomicBool value: false mirror: always # Whether to validate OpenType variation tables in fonts. - name: gfx.downloadable_fonts.validate_variation_tables type: RelaxedAtomicBool value: true mirror: always # Whether OTS validation should be applied to OpenType Layout (OTL) tables. - name: gfx.downloadable_fonts.otl_validation type: RelaxedAtomicBool value: @IS_NOT_RELEASE_OR_BETA@ mirror: always - name: gfx.e10s.font-list.shared type: bool value: true mirror: once # Do we fire a notification about missing fonts, so the front-end can decide # whether to try and do something about it (e.g. download additional fonts)? - name: gfx.missing_fonts.notify type: RelaxedAtomicBool value: false mirror: always #if !defined(MOZ_WIDGET_ANDROID) - name: gfx.egl.prefer-gles.enabled type: bool #if defined(MOZ_WIDGET_GTK) && defined(MOZ_AARCH64) value: true #else value: false #endif mirror: once #endif # [Windows] Whether registry FontSubstitutes entries are used unconditionally, # or only if the original font is not available. #if defined(XP_WIN) - name: gfx.windows-font-substitutes.always type: bool value: false mirror: once #endif - name: gfx.font-list-omt.enabled type: bool #if defined(XP_MACOSX) value: true #else value: false #endif mirror: once # [Android] OPPO, realme and OnePlus device seem to crash when using Font # Match API. We turn off this feature on these devices. Set true if you want to # turn on it at force. #if defined(MOZ_WIDGET_ANDROID) - name: gfx.font-list.use_font_match_api.force-enabled type: bool value: false mirror: once #endif # Whether to load fonts (e.g. Twemoji Mozilla) bundled with the application: # -1 - Auto behavior based on OS version (currently, disables loading on # "low-memory" Android devices) # 0 - Skip loading any bundled fonts # 1 - Always load bundled fonts - name: gfx.bundled-fonts.activate type: int32_t value: -1 mirror: once - name: gfx.font_loader.delay type: RelaxedAtomicUint32 #if defined(XP_WIN) value: 60000 #else value: 8000 #endif mirror: always # Disable antialiasing of Ahem, for use in tests. - name: gfx.font_rendering.ahem_antialias_none type: RelaxedAtomicBool value: false mirror: always #if defined(XP_DARWIN) # Set to true to revert from HarfBuzz AAT shaping to the old Core Text # backend. - name: gfx.font_rendering.coretext.enabled type: RelaxedAtomicBool value: false mirror: always #endif - name: gfx.font_rendering.colr_v1.enabled type: RelaxedAtomicBool value: true mirror: always - name: gfx.font_rendering.opentype_svg.enabled type: RelaxedAtomicBool value: true mirror: always rust: true - name: gfx.font_rendering.fallback.async type: RelaxedAtomicBool value: true mirror: always # whether to always search all font cmaps during system font fallback - name: gfx.font_rendering.fallback.always_use_cmaps type: RelaxedAtomicBool value: false mirror: always # whether to do font fallback for codepoints with General Category = Unassigned - name: gfx.font_rendering.fallback.unassigned_chars type: RelaxedAtomicBool value: false mirror: always #ifdef MOZ_WIDGET_GTK - name: gfx.font_rendering.fontconfig.max_generic_substitutions type: RelaxedAtomicUint32 value: 3 mirror: always #endif #if defined(XP_WIN) # Whether the DirectWrite bold simulation should be used when a bold font-weight # is requested but no bold face available in the family. This renders poorly with # some third-party fonts, so by default we disable it for webfonts and allow it # only with locally-installed fonts. # Values: # 0 - never use DWrite bold simulation; always multi-strike instead # 1 - use DWrite bold for installed fonts, multi-strike for webfont resources # 2 - use DWrite bold for all fonts - name: gfx.font_rendering.directwrite.bold_simulation type: RelaxedAtomicUint32 value: 1 mirror: always #endif - name: gfx.font_rendering.graphite.enabled type: RelaxedAtomicBool value: true mirror: always # Cache shaped word results - name: gfx.font_rendering.wordcache.charlimit type: RelaxedAtomicUint32 value: 32 mirror: always # Cache shaped word results - name: gfx.font_rendering.wordcache.maxentries type: RelaxedAtomicUint32 value: 10000 mirror: always # The level of logging: # - 0: no logging; # - 1: adds errors; # - 2: adds warnings; # - 3 or 4: adds debug logging. # If you set the value to 4, you will also need to set the environment # variable MOZ_LOG to gfx:4. See mozilla/Logging.h for details. - name: gfx.logging.level type: RelaxedAtomicInt32 value: mozilla::gfx::LOG_DEFAULT mirror: always include: mozilla/gfx/LoggingConstants.h - name: gfx.logging.crash.length type: uint32_t value: 16 mirror: once # The maximums here are quite conservative, we can tighten them if problems show up. - name: gfx.logging.texture-usage.enabled type: bool value: false mirror: once - name: gfx.logging.peak-texture-usage.enabled type: bool value: false mirror: once - name: gfx.logging.slow-frames.enabled type: bool value: false mirror: once # Use gfxPlatform::MaxAllocSize instead of the pref directly. - name: gfx.max-alloc-size type: int32_t value: (int32_t)0x7FFFFFFF mirror: once do_not_use_directly: true # Use gfxPlatform::MaxTextureSize instead of the pref directly. - name: gfx.max-texture-size type: int32_t value: (int32_t)32767 mirror: once do_not_use_directly: true - name: gfx.offscreencanvas.shared-provider type: RelaxedAtomicBool value: true mirror: always - name: gfx.offscreencanvas.snapshot-timeout-ms type: int32_t value: 10000 mirror: always - name: gfx.omta.background-color type: bool value: true mirror: always - name: gfx.partialpresent.force type: RelaxedAtomicInt32 value: 0 mirror: always # SwapInterval - name: gfx.swap-interval.glx type: RelaxedAtomicBool value: true mirror: always - name: gfx.swap-interval.egl type: RelaxedAtomicBool mirror: always #ifdef MOZ_WIDGET_ANDROID value: true #else value: false #endif # Log severe performance warnings to the error console and profiles. # This should be use to quickly find which slow paths are used by test cases. - name: gfx.perf-warnings.enabled type: RelaxedAtomicBool value: false mirror: always #ifdef MOZ_X11 # Whether to force using GLX over EGL. - name: gfx.x11-egl.force-disabled type: bool value: false mirror: once # Whether to force using EGL over GLX. - name: gfx.x11-egl.force-enabled type: bool value: false mirror: once - name: gfx.x11.glx_sgi_video_sync type: bool value: false mirror: once #endif - name: gfx.testing.device-fail type: RelaxedAtomicBool value: false mirror: always - name: gfx.testing.device-reset type: RelaxedAtomicInt32 value: 0 mirror: always # Meant to be used for tests only. If greater than 0 then we assert that the # number of active render textures increases by this amount or less. #ifdef DEBUG - name: gfx.testing.assert-render-textures-increase type: RelaxedAtomicInt32 value: 0 mirror: always #endif - name: gfx.text.disable-aa type: bool value: false mirror: once - name: gfx.text.subpixel-position.force-enabled type: bool value: false mirror: once - name: gfx.text.subpixel-position.force-disabled type: bool value: false mirror: once - name: gfx.use-iosurface-textures type: bool value: false mirror: once - name: gfx.use-mutex-on-present type: bool value: false mirror: once # Use SurfaceTextures as preferred backend for TextureClient/Host. - name: gfx.use-surfacetexture-textures type: bool value: false mirror: once - name: gfx.vsync.compositor.unobserve-count type: int32_t value: 10 mirror: once - name: gfx.vsync.force-disable-waitforvblank type: RelaxedAtomicBool value: false mirror: always - name: gfx.will-change.ignore-opacity type: RelaxedAtomicBool value: true mirror: always # Should we override the blocklist to enable WebGPU? - name: gfx.webgpu.ignore-blocklist type: bool value: false mirror: once # Whether to use the WebRender hardware backend - name: gfx.webrender.all type: bool value: false mirror: once #ifdef XP_WIN - name: gfx.webrender.force-angle type: bool value: true mirror: once #endif # WebRender is not enabled when there is no GPU process on window when # WebRender uses ANGLE. It is for avoiding that WebGL and WebRender use ANGLE # at once. But there is a case that we want to enable WebRender for testing. #ifdef XP_WIN - name: gfx.webrender.enabled-no-gpu-process-with-angle-win type: bool value: true mirror: once #endif - name: gfx.webrender.svg-filter-effects type: RelaxedAtomicBool value: true mirror: always - name: gfx.webrender.svg-filter-effects.also-convert-css-filters type: RelaxedAtomicBool value: false mirror: always - name: gfx.webrender.svg-filter-effects.also-use-for-docshell-fecolormatrix type: RelaxedAtomicBool value: false mirror: always - name: gfx.webrender.svg-filter-effects.opacity type: RelaxedAtomicBool value: true mirror: always - name: gfx.webrender.svg-filter-effects.toalpha type: RelaxedAtomicBool value: true mirror: always - name: gfx.webrender.svg-filter-effects.feblend type: RelaxedAtomicBool value: true mirror: always - name: gfx.webrender.svg-filter-effects.fecolormatrix type: RelaxedAtomicBool value: true mirror: always - name: gfx.webrender.svg-filter-effects.fecomponenttransfer type: RelaxedAtomicBool value: true mirror: always - name: gfx.webrender.svg-filter-effects.fecomposite type: RelaxedAtomicBool value: true mirror: always - name: gfx.webrender.svg-filter-effects.feconvolvematrix type: RelaxedAtomicBool value: false mirror: always - name: gfx.webrender.svg-filter-effects.fediffuselighting type: RelaxedAtomicBool value: false mirror: always - name: gfx.webrender.svg-filter-effects.fedisplacementmap type: RelaxedAtomicBool value: false mirror: always - name: gfx.webrender.svg-filter-effects.fedropshadow type: RelaxedAtomicBool value: true mirror: always - name: gfx.webrender.svg-filter-effects.feflood type: RelaxedAtomicBool value: true mirror: always - name: gfx.webrender.svg-filter-effects.fegaussianblur type: RelaxedAtomicBool value: true mirror: always - name: gfx.webrender.svg-filter-effects.feimage type: RelaxedAtomicBool value: false mirror: always - name: gfx.webrender.svg-filter-effects.femerge type: RelaxedAtomicBool value: true mirror: always - name: gfx.webrender.svg-filter-effects.femorphology type: RelaxedAtomicBool value: false mirror: always - name: gfx.webrender.svg-filter-effects.feoffset type: RelaxedAtomicBool value: true mirror: always - name: gfx.webrender.svg-filter-effects.fespecularlighting type: RelaxedAtomicBool value: false mirror: always - name: gfx.webrender.svg-filter-effects.fetile type: RelaxedAtomicBool value: false mirror: always - name: gfx.webrender.svg-filter-effects.feturbulence type: RelaxedAtomicBool value: false mirror: always - name: gfx.webrender.svg-images type: RelaxedAtomicBool value: true mirror: always - name: gfx.webrender.svg-shapes type: RelaxedAtomicBool value: true mirror: always - name: gfx.webrender.debug.blob.paint-flashing type: RelaxedAtomicBool value: false mirror: always - name: gfx.webrender.debug.enable-capture type: bool value: false mirror: once - name: gfx.webrender.debug.dl.dump-parent type: RelaxedAtomicBool value: false mirror: always - name: gfx.webrender.debug.dl.dump-content type: RelaxedAtomicBool value: false mirror: always - name: gfx.webrender.debug.dl.dump-content-serialized type: RelaxedAtomicBool value: false mirror: always # When true, we output warning messages when rejecting surface promotion # when it has been requested. This is important for color correctness of # wide color videos, as well as for GPU performance for all videos. - name: gfx.webrender.debug.surface-promotion-logging type: RelaxedAtomicBool value: false mirror: always #ifdef MOZ_WIDGET_GTK - name: gfx.webrender.reject-software-driver type: bool value: true mirror: once #endif - name: gfx.webrender.debug.highlight-painted-layers type: RelaxedAtomicBool value: false mirror: always - name: gfx.webrender.debug.slow-cpu-frame-threshold type: AtomicFloat value: 10.0 mirror: always - name: gfx.webrender.late-scenebuild-threshold type: RelaxedAtomicInt32 value: 4 mirror: always - name: gfx.webrender.max-filter-ops-per-chain type: RelaxedAtomicUint32 value: 64 mirror: always - name: gfx.webrender.batching.lookback type: uint32_t value: 10 mirror: always - name: gfx.webrender.blob-tile-size type: uint32_t value: 256 mirror: always - name: gfx.webrender.batched-upload-threshold type: int32_t #if defined(MOZ_WIDGET_ANDROID) value: 262144 #else value: 65536 #endif mirror: always - name: gfx.webrender.compositor type: bool #if defined(XP_WIN) || defined(XP_MACOSX) value: true #else value: false #endif mirror: once #ifdef NIGHTLY_BUILD # Keep this pref hidden on non-nightly builds to avoid people accidentally # turning it on. - name: gfx.webrender.layer-compositor type: bool value: false mirror: once #endif - name: gfx.webrender.scissored-cache-clears.enabled type: bool value: true mirror: once - name: gfx.webrender.scissored-cache-clears.force-enabled type: bool value: false mirror: once - name: gfx.webrender.compositor.force-enabled type: bool value: false mirror: once - name: gfx.webrender.compositor.max_update_rects type: uint32_t value: 1 mirror: once - name: gfx.webrender.compositor.surface-pool-size type: uint32_t value: 25 mirror: once # Number of damage rects we can give to the compositor for a new frame with # partial present. This controls whether partial present is used or not. - name: gfx.webrender.max-partial-present-rects type: uint32_t #if defined(XP_WIN) || defined(MOZ_WIDGET_ANDROID) || defined(MOZ_WIDGET_GTK) value: 1 #else value: 0 #endif mirror: once # Whether or not we can reuse the buffer contents using the GL buffer age # extension, if supported by the platform. This requires partial present # to be used. - name: gfx.webrender.allow-partial-present-buffer-age type: bool value: true mirror: once # Whether or not we should force partial present on. - name: gfx.webrender.force-partial-present type: bool value: false mirror: once - name: gfx.webrender.enable-gpu-markers type: bool #ifdef DEBUG value: true #else value: false #endif mirror: once - name: gfx.webrender.enable-item-cache type: bool value: true mirror: once # Whether or not to fallback from WebRender to Software WebRender. - name: gfx.webrender.fallback.software type: bool value: true mirror: once #ifdef XP_WIN # Use IDCompositionFilterEffect to color manage dcomp surfaces. - name: gfx.webrender.dcomp.color-manage-with-filters type: RelaxedAtomicBool value: false mirror: always # Whether to use an overlay of hardware decoded video with DirectComposition - name: gfx.webrender.dcomp-video-hw-overlay-win type: bool value: true mirror: once # Enable hardware decoded video overlay even when it is blocked. - name: gfx.webrender.dcomp-video-hw-overlay-win-force-enabled type: bool value: false mirror: once # Whether to use a yuv video overlay layers with DirectComposition - name: gfx.webrender.dcomp-video-yuv-overlay-win type: bool value: false mirror: once - name: gfx.webrender.dcomp-video-vp-scaling-win type: bool value: true mirror: once # Whether to use virtual surfaces, as opposed to each tile owning a surface. - name: gfx.webrender.dcomp-use-virtual-surfaces type: bool value: true mirror: once # Whether to use an overlay of software decoded video with DirectComposition - name: gfx.webrender.dcomp-video-sw-overlay-win type: bool value: true mirror: once # Enable software decoded video overlay even when it is blocked. - name: gfx.webrender.dcomp-video-sw-overlay-win-force-enabled type: bool value: false mirror: once - name: gfx.webrender.dcomp-video-check-slow-present type: RelaxedAtomicBool value: true mirror: always # Force triple buffering in overlay's video swap chain - name: gfx.webrender.dcomp-video-force-triple-buffering type: RelaxedAtomicBool value: false mirror: always - name: gfx.webrender.dcomp-video-swap-chain-present-interval-0 type: RelaxedAtomicBool value: false mirror: always - name: gfx.video.convert-yuv-to-nv12.image-host-win type: RelaxedAtomicBool value: true mirror: always #endif # Whether or not fallback to Software WebRender requires the GPU process. - name: gfx.webrender.fallback.software.requires-gpu-process type: bool value: false mirror: once - name: gfx.webrender.program-binary-disk type: bool #if defined(XP_WIN) || defined(ANDROID) value: true #else value: false #endif mirror: once - name: gfx.webrender.use-optimized-shaders type: bool value: true mirror: once - name: gfx.webrender.precache-shaders type: bool value: false mirror: once # When gl debug message is a high severity message, forwward it to gfx critical # note. - name: gfx.webrender.gl-debug-message-critical-note type: bool #if defined(XP_WIN) && defined(NIGHTLY_BUILD) value: true #else value: false #endif mirror: once # Enable printing gl debug messages - name: gfx.webrender.gl-debug-message-print type: bool value: false mirror: once #ifdef NIGHTLY_BUILD # Keep this pref hidden on non-nightly builds to avoid people accidentally # turning it on. - name: gfx.webrender.panic-on-gl-error type: bool value: false mirror: once #endif #ifdef XP_WIN # Enables display of performance debugging counters when DirectComposition # is used. # Performance counters are displayed on the top-right corner of the screen. - name: gfx.webrender.debug.dcomp-counter type: RelaxedAtomicBool value: false mirror: always # Enables highlighting redraw regions of DCompositionVisual - name: gfx.webrender.debug.dcomp-redraw-regions type: RelaxedAtomicBool value: false mirror: always #endif #ifdef XP_DARWIN # Files show up in $HOME/Desktop/nativelayerdumps-PID/frame-123.html - name: gfx.webrender.debug.dump-native-layer-tree-to-file type: RelaxedAtomicBool value: false mirror: always #endif - name: gfx.webrender.enable-low-priority-pool type: RelaxedAtomicBool #if defined(ANDROID) value: false #else value: true #endif mirror: always # Force subpixel anti-aliasing as much as possible, despite performance cost. - name: gfx.webrender.quality.force-subpixel-aa-where-possible type: bool value: false mirror: always - name: gfx.webrender.enable-subpixel-aa type: bool mirror: once #ifdef MOZ_WIDGET_ANDROID value: false #else value: true #endif #ifdef XP_MACOSX - name: gfx.webrender.enable-client-storage type: bool value: true mirror: once #endif # Width of WebRender tile size - name: gfx.webrender.picture-tile-width type: RelaxedAtomicInt32 value: 1024 mirror: always # Width of WebRender tile size - name: gfx.webrender.picture-tile-height type: RelaxedAtomicInt32 value: 512 mirror: always # WebRender upper bound for shared surface size # According to apitrace, textures larger than 2048 break fast clear # optimizations on some intel drivers. We sometimes need to go larger, but # we try to avoid it. - name: gfx.webrender.max-shared-surface-size type: int32_t value: 2048 mirror: once # Whether to use EGL robustness or not. - name: gfx.webrender.prefer-robustness type: bool #if defined(XP_WIN) || defined(MOZ_WIDGET_GTK) value: true #else value: false #endif mirror: once # Whether to use the WebRender software backend - name: gfx.webrender.software type: bool value: false mirror: once # Whether to use the D3D11 RenderCompositor when using WebRender software backend - name: gfx.webrender.software.d3d11 type: bool value: true mirror: once - name: gfx.webrender.software.opengl type: bool #if defined(MOZ_WIDGET_ANDROID) value: true #else value: false #endif mirror: once - name: gfx.webrender.software.d3d11.upload-mode type: RelaxedAtomicInt32 value: 4 mirror: always # Whether to force widgets to don't support acceleration to use WebRender # despite that - name: gfx.webrender.unaccelerated-widget.force type: RelaxedAtomicBool value: false mirror: always # Enable a lower quality, but higher performance pinch-zoom mode. Primarily # for devices with weak GPUs, or when running SWGL. - name: gfx.webrender.low-quality-pinch-zoom type: bool #if defined(MOZ_WIDGET_ANDROID) && defined(NIGHTLY_BUILD) value: true #else value: false #endif mirror: once # Disable wait of GPU execution completion - name: gfx.webrender.wait-gpu-finished.disabled type: bool #if defined(XP_WIN) value: true #else value: false #endif mirror: once # Enable VideoProcessor Super Resolution for video overlay - name: gfx.webrender.overlay-vp-super-resolution type: bool #if defined(XP_WIN) value: true #else value: false #endif mirror: once # Enable VideoProcessor-HDR on SDR content for video overlay - name: gfx.webrender.overlay-vp-auto-hdr type: bool #if defined(XP_WIN) value: true #else value: false #endif mirror: once # Enable a dedicated arena on frame builder threads. - name: gfx.webrender.frame-builder-thread-local-arena type: bool rust: true value: false mirror: once # Enable a dedicated arena on scene builder threads. - name: gfx.webrender.scene-builder-thread-local-arena type: bool rust: true value: false mirror: once # Enable a dedicated arena on WebRender worker threads. - name: gfx.webrender.worker-thread-local-arena type: bool rust: true value: true mirror: once # Use vsync events generated by hardware - name: gfx.work-around-driver-bugs type: bool value: true mirror: once - name: gfx.ycbcr.accurate-conversion type: RelaxedAtomicBool value: false mirror: always - name: gfx.remote-texture.recycle.disabled type: RelaxedAtomicBool value: false mirror: always - name: gfx.remote-texture.wait-owner-at-image-host type: RelaxedAtomicBool value: false mirror: always #--------------------------------------------------------------------------- # Prefs starting with "gl." (OpenGL) #--------------------------------------------------------------------------- - name: gl.allow-high-power type: RelaxedAtomicBool value: true mirror: always - name: gl.ignore-dx-interop2-blacklist type: RelaxedAtomicBool value: false mirror: always - name: gl.use-tls-is-current type: RelaxedAtomicInt32 value: 0 mirror: always #--------------------------------------------------------------------------- # Prefs starting with "html5." #--------------------------------------------------------------------------- # Time in milliseconds between the time a network buffer is seen and the timer # firing when the timer hasn't fired previously in this parse in the # off-the-main-thread HTML5 parser. - name: html5.flushtimer.initialdelay type: RelaxedAtomicInt32 value: 16 mirror: always # Time in milliseconds between the time a network buffer is seen and the timer # firing when the timer has already fired previously in this parse. - name: html5.flushtimer.subsequentdelay type: RelaxedAtomicInt32 value: 16 mirror: always #--------------------------------------------------------------------------- # Prefs starting with "idle_period." #--------------------------------------------------------------------------- - name: idle_period.min type: uint32_t value: 3 mirror: always - name: idle_period.during_page_load.min type: uint32_t value: 12 mirror: always - name: idle_period.cross_process_scheduling type: RelaxedAtomicBool value: true mirror: always #--------------------------------------------------------------------------- # Prefs starting with "image." #--------------------------------------------------------------------------- # The maximum size (in kB) that the aggregate frames of an animation can use # before it starts to discard already displayed frames and redecode them as # necessary. - name: image.animated.decode-on-demand.threshold-kb type: RelaxedAtomicUint32 value: 20*1024 mirror: always # The minimum number of frames we want to have buffered ahead of an # animation's currently displayed frame. - name: image.animated.decode-on-demand.batch-size type: RelaxedAtomicUint32 value: 6 mirror: always # Whether we should recycle already displayed frames instead of discarding # them. This saves on the allocation itself, and may be able to reuse the # contents as well. Only applies if generating full frames. - name: image.animated.decode-on-demand.recycle type: bool value: true mirror: once # Resume an animated image from the last displayed frame rather than # advancing when out of view. - name: image.animated.resume-from-last-displayed type: RelaxedAtomicBool value: true mirror: always # Maximum number of surfaces for an image before entering "factor of 2" mode. # This in addition to the number of "native" sizes of an image. A native size # is a size for which we can decode a frame without up or downscaling. Most # images only have 1, but some (i.e. ICOs) may have multiple frames for the # same data at different sizes. - name: image.cache.factor2.threshold-surfaces type: RelaxedAtomicInt32 value: 4 mirror: always # Maximum size of a surface in KB we are willing to produce when rasterizing # an SVG. - name: image.cache.max-rasterized-svg-threshold-kb type: RelaxedAtomicInt32 value: 200*1024 mirror: always # The maximum size, in bytes, of the decoded images we cache. - name: image.cache.size type: int32_t value: 5*1024*1024 mirror: once # A weight, from 0-1000, to place on time when comparing to size. # Size is given a weight of 1000 - timeweight. - name: image.cache.timeweight type: int32_t value: 500 mirror: once # Decode all images automatically on load, ignoring our normal heuristics. - name: image.decode-immediately.enabled type: RelaxedAtomicBool value: false mirror: always # Decode all images synchronously, intended to be used for reftests. - name: image.testing.decode-sync.enabled type: bool value: false mirror: always # Whether we attempt to downscale images during decoding. - name: image.downscale-during-decode.enabled type: RelaxedAtomicBool value: true mirror: always # Whether we use EXIF metadata for image density. - name: image.exif-density-correction.enabled type: RelaxedAtomicBool value: true mirror: always # Whether EXIF density metadata is sanity checked against PixelXDimension and PixelYDimension - name: image.exif-density-correction.sanity-check.enabled type: RelaxedAtomicBool value: true mirror: always # The threshold for inferring that changes to an element's |src| # attribute by JavaScript represent an animation, in milliseconds. If the |src| # attribute is changing more frequently than this value, then we enter a # special "animation mode" which is designed to eliminate flicker. Set to 0 to # disable. - name: image.infer-src-animation.threshold-ms type: RelaxedAtomicUint32 value: 2000 mirror: always # Whether the network request priority should be adjusted according # the layout and view frame position of each particular image. - name: image.layout_network_priority type: RelaxedAtomicBool value: true mirror: always # Chunk size for calls to the image decoders. - name: image.mem.decode_bytes_at_a_time type: uint32_t value: 16384 mirror: once # Discards inactive image frames and re-decodes them on demand from # compressed data. - name: image.mem.discardable type: RelaxedAtomicBool value: true mirror: always # Discards inactive image frames of _animated_ images and re-decodes them on # demand from compressed data. Has no effect if image.mem.discardable is false. - name: image.mem.animated.discardable type: bool value: true mirror: once # Enable extra information for debugging in the image memory reports. - name: image.mem.debug-reporting type: RelaxedAtomicBool value: false mirror: always # Force unmapping of unused shared surfaces after a timeout period or when we # encounter virtual memory pressure. By default this is only enabled on 32-bit # Firefox. - name: image.mem.shared.unmap.force-enabled type: bool value: false mirror: once # Minimum timeout to unmap shared surfaces since they have been last used, # in milliseconds. - name: image.mem.shared.unmap.min_expiration_ms type: uint32_t value: 60*1000 mirror: once # Mininum size for shared surfaces to consider unmapping, in kilobytes. - name: image.mem.shared.unmap.min_threshold_kb type: uint32_t value: 100 mirror: once # How much of the data in the surface cache is discarded when we get a memory # pressure notification, as a fraction. The discard factor is interpreted as a # reciprocal, so a discard factor of 1 means to discard everything in the # surface cache on memory pressure, a discard factor of 2 means to discard half # of the data, and so forth. The default should be a good balance for desktop # and laptop systems, where we never discard visible images. - name: image.mem.surfacecache.discard_factor type: uint32_t value: 1 mirror: once # Maximum size for the surface cache, in kilobytes. - name: image.mem.surfacecache.max_size_kb type: uint32_t value: 2024 * 1024 mirror: once # Minimum timeout for expiring unused images from the surface cache, in # milliseconds. This controls how long we store cached temporary surfaces. - name: image.mem.surfacecache.min_expiration_ms type: uint32_t value: 60*1000 mirror: once # The surface cache's size, within the constraints of the maximum size set # above, is determined as a fraction of main memory size. The size factor is # interpreted as a reciprocal, so a size factor of 4 means to use no more than # 1/4 of main memory. The default should be a good balance for most systems. - name: image.mem.surfacecache.size_factor type: uint32_t value: 4 mirror: once # Maximum size in kilobytes that we allow to allocate an imgFrame, meant for # testing/fuzzing purposes. -1 disables this limit (there are other limits in # place). - name: image.mem.max_legal_imgframe_size_kb type: RelaxedAtomicInt32 value: -1 mirror: always # Whether we record SVG images as blobs or not. - name: image.svg.blob-image type: RelaxedAtomicBool value: false mirror: always # Whether to set the incremental attribute in the Priority header for images - name: image.priority.incremental type: RelaxedAtomicBool value: true mirror: always # Whether we attempt to decode AVIF images or not. - name: image.avif.enabled type: RelaxedAtomicBool #if defined(MOZ_AV1) value: true #else value: false #endif mirror: always # How strict we are in accepting/rejecting AVIF inputs according to whether they # conform to the specification # 0 = Permissive: accept whatever we can simply, unambiguously interpret # 1 = Normal: reject violations of "shall" specification directives # 2 = Strict: reject violations of "should" specification directives - name: image.avif.compliance_strictness type: RelaxedAtomicInt32 value: 1 mirror: always # Whether we apply container-level transforms like mirroring and rotation - name: image.avif.apply_transforms type: RelaxedAtomicBool value: true mirror: always # Whether we use dav1d (true) or libaom (false) to decode AVIF image - name: image.avif.use-dav1d type: RelaxedAtomicBool value: true mirror: always # Whether to allow decoding of animated AVIF sequences. - name: image.avif.sequence.enabled type: RelaxedAtomicBool value: true mirror: always # Whether AVIF files containing sequences should be animated even when the # major brand is set to 'avif'. - name: image.avif.sequence.animate_avif_major_branded_images type: RelaxedAtomicBool value: false mirror: always # Whether we attempt to decode JXL images or not. - name: image.jxl.enabled type: RelaxedAtomicBool value: false mirror: always #--------------------------------------------------------------------------- # Prefs starting with "intl." #--------------------------------------------------------------------------- #ifdef XP_WIN # Whether making Gecko TSF-aware or only working with IMM. TSF is a modern # IME API set of Windows which replaces IMM APIs. Unless you can avoid the # problem which you see with enabling TSF, you shouldn't change this pref # to false since IMM handler is now not maintained nor tested with latest # Windows. If you need to change this pref to false, please file a bug to # . # Restart required to apply this pref change. - name: intl.tsf.enabled type: bool value: true mirror: once # Whether Gecko creates or does not create native caret for legacy ATOK # (2011 - 2015). - name: intl.tsf.hack.atok.create_native_caret type: bool value: true mirror: always # Whether Gecko returns available composition string rect or TS_E_NOLAYOUT # from ITextStoreACP::GetTextExt() when the specified range is same as the # range of composition string but some character rects in it are still # dirty if and only if ATOK is active TIP. # Note that this is ignored if active ATOK is or older than 2016 and # create_native_caret is true. - name: intl.tsf.hack.atok.do_not_return_no_layout_error_of_composition_string type: bool value: true mirror: always # Whether Gecko sets input scope of ATOK to "search" or never does it. # When "search" is set to the input scope, ATOK may stop their suggestions. # To avoid it, turn this pref on, or changing the settings in ATOK. # Note that if you enable this pref and you use the touch keyboard for touch # screens, you cannot access some specific features for a "search" input # field. - name: intl.tsf.hack.atok.search_input_scope_disabled type: bool value: false mirror: always # Whether Gecko returns caret rect before composition string or TS_E_NOLAYOUT # from ITextStoreACP::GetTextExt() when the specified range is larger than # composition start offset if and only if Free ChangJie is active TIP. - name: intl.tsf.hack.free_chang_jie.do_not_return_no_layout_error type: bool value: true mirror: always # Whether Gecko returns available composition string rect or TS_E_NOLAYOUT # from ITextStoreACP::GetTextExt() when the specified range is same as the # range of composition string but some character rects in it are still # dirty if and only if Japanist 10 is active TIP. - name: intl.tsf.hack.japanist10.do_not_return_no_layout_error_of_composition_string type: bool value: true mirror: always # Whether Gecko returns previous character rect or TS_E_NOLAYOUT from # ITfContextView::GetTextExt() when the specified range is the first # character of selected clause of composition string if and only if Japanese TIP # of Microsoft is active. - name: intl.tsf.hack.ms_japanese_ime.do_not_return_no_layout_error_at_first_char type: bool value: true mirror: always # Whether Gecko returns previous character rect or TS_E_NOLAYOUT from # ITfContextView::GetTextExt() when the specified range is the caret of # composition string if and only if Japanese TIP of Microsoft is active. - name: intl.tsf.hack.ms_japanese_ime.do_not_return_no_layout_error_at_caret type: bool value: true mirror: always # Whether Gecko returns caret rect before composition string or TS_E_NOLAYOUT # from ITfContextView::GetTextExt() when the specified range is larger than # composition start offset if and only Simplified Chinese TIP of Microsoft # is active. - name: intl.tsf.hack.ms_simplified_chinese.do_not_return_no_layout_error type: bool value: true mirror: always # Whether Geckos hacks ITextStoreACP::QueryInsert() or not. The method should # return new selection after specified length text is inserted at specified # range. However, Microsoft Pinyin and Microsoft Wubi expect that the result # is same as specified range. If following prefs are true, # ITextStoreACP::QueryInsert() returns specified range only when one of the # TIPs is active. - name: intl.tsf.hack.ms_simplified_chinese.query_insert_result type: bool value: true mirror: always # Whether Gecko returns caret rect before composition string or TS_E_NOLAYOUT # from ITfContextView::GetTextExt() when the specified range is larger than # composition start offset if and only Traditional Chinese TIP of Microsoft # is active. - name: intl.tsf.hack.ms_traditional_chinese.do_not_return_no_layout_error type: bool value: true mirror: always # Whether Geckos hacks ITextStoreACP::QueryInsert() or not. The method should # return new selection after specified length text is inserted at specified # range. However, Microsoft ChangJie and Microsoft Quick expect that the # result is same as specified range. If following prefs are true, # ITextStoreACP::QueryInsert() returns specified range only when one of the # TIPs is active. - name: intl.tsf.hack.ms_traditional_chinese.query_insert_result type: bool value: true mirror: always # Whether Gecko sets input scope of the URL bar to IS_DEFAULT when black # listed IMEs are active or does not. If you use tablet mode mainly and you # want to use touch keyboard for URL when you set focus to the URL bar, you # can set this to false. Then, you'll see, e.g., ".com" key on the keyboard. # However, if you set this to false, such IMEs set its open state to "closed" # when you set focus to the URL bar. I.e., input mode is automatically # changed to English input mode. # Known buggy IME list: # - Microsoft IME for Japanese # - Google Japanese Input # - Microsoft Bopomofo # - Microsoft ChangJie # - Microsoft Phonetic # - Microsoft Quick # - Microsoft New ChangJie # - Microsoft New Phonetic # - Microsoft New Quick # - Microsoft Pinyin # - Microsoft Pinyin New Experience Input Style # - Microsoft Wubi # - Microsoft IME for Korean (except on Win7) # - Microsoft Old Hangul - name: intl.ime.hack.set_input_scope_of_url_bar_to_default type: bool value: true mirror: always # On Windows 10 Build 17643 (an Insider Preview build of RS5), Microsoft # have fixed the caller of ITextACPStore::GetTextExt() to return # TS_E_NOLAYOUT to TIP as-is, rather than converting to E_FAIL. # Therefore, if TIP supports asynchronous layout computation perfectly, we # can return TS_E_NOLAYOUT and TIP waits next OnLayoutChange() # notification. However, some TIPs still have some bugs of asynchronous # layout support. We keep hacking the result of GetTextExt() like running # on Windows 10, however, there could be unknown TIP bugs if we stop # hacking the result. So, user can stop checking build ID to make Gecko # hack the result forcibly. - name: intl.tsf.hack.allow_to_stop_hacking_on_build_17643_or_later type: bool value: @IS_EARLY_BETA_OR_EARLIER@ mirror: always # If true, automatically extend selection to cluster boundaries when # TSF/TIP requests to select from/by middle of a cluster. - name: intl.tsf.hack.extend_setting_selection_range_to_cluster_boundaries type: bool value: @IS_NOT_EARLY_BETA_OR_EARLIER@ mirror: always # Whether Gecko supports IMM even if TSF is enabled. This pref exists # only for check TSF behavior of new versions. Therefore, users should # not set this to false for daily use. - name: intl.tsf.support_imm type: bool value: true mirror: once # If true, TSF and TIP (IME) can retrieve URL of the document containing # the focused element. When this is set to true, Gecko exposes the spec # of the URL. # And Gecko exposes only "http" and "https" URLs. E.g., "data", "blob", # "file" URLs are never exposed. - name: intl.tsf.expose_url.allowed type: bool value: true mirror: always # If true, TSF and TIP (IME) can retrieve URL of the document containing # the focused element in the private browsing mode too. - name: intl.tsf.expose_url_in_private_browsing.allowed type: bool value: false mirror: always #if defined(ENABLE_TESTS) # If true, NS_GetComplexLineBreaks compares the line breaks produced in the # content process using the Uniscribe line breaker, with those from a # brokered call to the parent. - name: intl.compare_against_brokered_complex_line_breaks type: bool value: false mirror: always #endif #endif # If you use legacy Chinese IME which puts an ideographic space to composition # string as placeholder, this pref might be useful. If this is true and when # web contents forcibly commits composition (e.g., moving focus), the # ideographic space will be ignored (i.e., commits with empty string). - name: intl.ime.remove_placeholder_character_at_commit type: bool value: false mirror: always #if defined(XP_MACOSX) || defined(MOZ_WIDGET_GTK) || defined(ANDROID) # Whether text input without keyboard press nor IME composition should cause a # set of composition events or not. E.g., when you use Emoji picker on macOS, # it inserts an Emoji character directly. If set to true, `compositionstart`, # `compositionupdate` and `compositionend` events will be fired, and the # correspnding `beforeinput` events are not cancelable. Otherwise, if set to # false, any user input events are not exposed to web apps but only # `beforeinput` event is fired as "insert text" as a cancelable event. - name: intl.ime.use_composition_events_for_insert_text type: bool value: false mirror: always #endif # If true, we use UAX14/29 compatible segmenter rules using ICU4X - name: intl.icu4x.segmenter.enabled type: RelaxedAtomicBool value: true mirror: always #--------------------------------------------------------------------------- # Prefs starting with "javascript." # # NOTE: SpiderMonkey starts up before `mirror: once` preferences are sealed and # we cannot use them (Bug 1698311). Instead, we use `mirror: always` # prefs but mark as `do_not_use_directly` and `LoadStartupJSPrefs` will # mirror them into SpiderMonkey. #--------------------------------------------------------------------------- # The JavaScript JIT compilers. These are read once on startup so a browser may # need to be restarted if toggling them. In general each subsequent JIT depends # on the ones before it being enabled. - name: javascript.options.blinterp type: bool value: true mirror: always # LoadStartupJSPrefs do_not_use_directly: true - name: javascript.options.baselinejit type: bool value: true mirror: always # LoadStartupJSPrefs do_not_use_directly: true - name: javascript.options.ion type: bool value: true mirror: always # LoadStartupJSPrefs do_not_use_directly: true # The irregexp JIT for regex evaluation. - name: javascript.options.native_regexp type: bool value: true mirror: always # LoadStartupJSPrefs do_not_use_directly: true # Jit Hints Cache - An in-process cache for the # content process to accelerate repeated baseline # compilations - name: javascript.options.jithints type: bool value: true mirror: always # LoadStartupJSPrefs do_not_use_directly: true # "Warm-up" thresholds at which we attempt to compile a script/function with # the next JIT tier. # # NOTE: These must match JitOptions defaults. - name: javascript.options.blinterp.threshold type: int32_t value: 10 mirror: always # LoadStartupJSPrefs do_not_use_directly: true - name: javascript.options.baselinejit.threshold type: int32_t value: 100 mirror: always # LoadStartupJSPrefs do_not_use_directly: true - name: javascript.options.ion.threshold type: int32_t value: 1500 mirror: always # LoadStartupJSPrefs do_not_use_directly: true # Enable off-main-thread Warp compilation. - name: javascript.options.ion.offthread_compilation type: bool value: true mirror: always # LoadStartupJSPrefs do_not_use_directly: true #ifdef DEBUG # Enable extra correctness checks in the JITs that are slow and only available # in debug builds. - name: javascript.options.jit.full_debug_checks type: bool value: false mirror: always # LoadStartupJSPrefs do_not_use_directly: true #endif # Heuristic threshold for Warp/Ion to decide that too many bailouts are # happening and an IonScript should be discarded. # # NOTE: This must match JitOptions defaults. - name: javascript.options.ion.frequent_bailout_threshold type: int32_t value: 10 mirror: always # LoadStartupJSPrefs do_not_use_directly: true # A threshold for Warp to decide whether a function can be inlined. # If the size of a function is smaller than this threshold, then it # may be inlined. # # NOTE: These must match JitOptions defaults. - name: javascript.options.inlining_bytecode_max_length type: uint32_t value: 130 mirror: always do_not_use_directly: true - name: javascript.options.compact_on_user_inactive type: bool value: true mirror: always # No-op pref for testing the SpiderMonkey pref system. - name: javascript.options.tests.uint32-pref type: uint32_t value: 1 mirror: always set_spidermonkey_pref: always # Enable fuse based destructuring - name: javascript.options.destructuring_fuse type: bool value: true mirror: always set_spidermonkey_pref: startup # The default amount of time to wait from the user being idle to starting a # shrinking GC. Measured in milliseconds. - name: javascript.options.compact_on_user_inactive_delay type: uint32_t #ifdef NIGHTLY_BUILD value: 15000 #else value: 300000 #endif mirror: always # Use the realm local dom alloc site. - name: javascript.options.dom_alloc_site type: bool value: true mirror: always set_spidermonkey_pref: always # Use better error message when accessing property of null or undefined. - name: javascript.options.property_error_message_fix type: bool value: @IS_NIGHTLY_OR_DEV_EDITION@ mirror: always set_spidermonkey_pref: startup # Support for weak references in JavaScript (WeakRef and FinalizationRegistry). - name: javascript.options.weakrefs type: bool value: true mirror: always set_spidermonkey_pref: startup # Whether to expose the FinalizationRegistry.prototype.cleanupSome method. - name: javascript.options.experimental.weakrefs.expose_cleanupSome type: bool value: false mirror: always set_spidermonkey_pref: startup # ShadowRealms: https://github.com/tc39/proposal-shadowrealm - name: javascript.options.experimental.shadow_realms # Atomic, as we assert the preference, and that assertion may happen # in a worker. type: RelaxedAtomicBool value: false mirror: always # Non-startup pref because the WPT test harness sets prefs after startup. set_spidermonkey_pref: always # Support for String.prototype.{is,to}WellFormed in JavaScript. - name: javascript.options.well_formed_unicode_strings type: bool value: true mirror: always set_spidermonkey_pref: startup # Support for Object.groupBy/Map.groupBy in JavaScript. - name: javascript.options.array_grouping type: bool value: true mirror: always set_spidermonkey_pref: startup # Experimental support for ArrayBuffer.prototype.transfer{,ToFixedLength}() in JavaScript. - name: javascript.options.arraybuffer_transfer type: bool value: true mirror: always set_spidermonkey_pref: startup # Experimental support for New Set methods - name: javascript.options.experimental.new_set_methods type: bool value: true mirror: always set_spidermonkey_pref: startup # Experimental support for resizable ArrayBuffers in JavaScript. - name: javascript.options.experimental.arraybuffer_resizable type: bool value: true mirror: always set_spidermonkey_pref: startup # Experimental support for growable SharedArrayBuffers in JavaScript. - name: javascript.options.experimental.sharedarraybuffer_growable type: bool value: true mirror: always set_spidermonkey_pref: startup # Experimental support for Duplicate Named Capture Groups in JavaScript. - name: javascript.options.experimental.regexp_duplicate_named_groups type: bool value: true mirror: always set_spidermonkey_pref: startup # Experimental support for Float16Array in JavaScript. - name: javascript.options.experimental.float16array type: bool value: true mirror: always set_spidermonkey_pref: startup # Experimental support for Pattern Modifiers in JavaScript. - name: javascript.options.experimental.regexp_modifiers type: bool value: true mirror: always set_spidermonkey_pref: startup # Experimental support for Uint8Array base64/hex in JavaScript. - name: javascript.options.experimental.uint8array_base64 type: bool value: true mirror: always set_spidermonkey_pref: startup # Experimental support for Promise.try in JavaScript. - name: javascript.options.experimental.promise_try type: bool value: true mirror: always set_spidermonkey_pref: startup # Experimental support for RegExp.escape in JavaScript. - name: javascript.options.experimental.regexp_escape type: bool value: true mirror: always set_spidermonkey_pref: startup #ifdef NIGHTLY_BUILD # Experimental support for Async Iterator Helpers in JavaScript. - name: javascript.options.experimental.async_iterator_helpers type: bool value: false mirror: always set_spidermonkey_pref: startup # Experimental support for Symbols as WeakMap keys in JavaScript. - name: javascript.options.experimental.symbols_as_weakmap_keys type: bool value: false mirror: always set_spidermonkey_pref: startup # Experimental support for Import Assertions in JavaScript. - name: javascript.options.experimental.import_attributes type: bool value: false mirror: always # Experimental support for Error.isError in JavaScript. - name: javascript.options.experimental.error_iserror type: bool value: false mirror: always set_spidermonkey_pref: startup # Experimental support for Math.sumPrecise in JavaScript. - name: javascript.options.experimental.math_sumprecise type: bool value: false mirror: always set_spidermonkey_pref: startup # Experimental support for Iterator.range in JavaScript. - name: javascript.options.experimental.iterator_range type: bool value: false mirror: always set_spidermonkey_pref: startup # Experimental support for Joint Iteration in JavaScript. - name: javascript.options.experimental.joint_iteration type: bool value: false mirror: always set_spidermonkey_pref: startup # Experimental support for Atomics.pause in JavaScript. - name: javascript.options.experimental.atomics_pause type: bool value: false mirror: always set_spidermonkey_pref: startup # Experimental support for Iterator Sequencing in JavaScript. - name: javascript.options.experimental.iterator_sequencing type: bool value: false mirror: always set_spidermonkey_pref: startup #endif // NIGHTLY_BUILD #ifdef JS_HAS_TEMPORAL_API # Experimental support for Temporal in JavaScript. - name: javascript.options.experimental.temporal type: bool value: false mirror: always set_spidermonkey_pref: startup #endif // JS_HAS_TEMPORAL_API #ifdef ENABLE_EXPLICIT_RESOURCE_MANAGEMENT # Experimental support for Explicit Resource Management in JavaScript. - name: javascript.options.experimental.explicit_resource_management type: bool value: false mirror: always set_spidermonkey_pref: always #endif // ENABLE_EXPLICIT_RESOURCE_MANAGEMENT - name: javascript.options.experimental.json_parse_with_source type: bool value: true mirror: always set_spidermonkey_pref: always - name: javascript.options.wasm_caching type: bool value: true mirror: always # The amount of time we wait between a request to GC (due to leaving a page) and doing the actual GC, in ms. - name: javascript.options.gc_delay type: uint32_t value: 4000 mirror: always # The amount of time we wait from the first request to GC to actually doing the first GC, in ms. - name: javascript.options.gc_delay.first type: uint32_t value: 10000 mirror: always # After doing a zonal GC, wait this much time (in ms) and then do a full GC, # unless one is already pending. - name: javascript.options.gc_delay.full type: uint32_t value: 60000 mirror: always # Maximum amount of time that should elapse between incremental GC slices, in ms. - name: javascript.options.gc_delay.interslice type: uint32_t value: 250 mirror: always # nsJSEnvironmentObserver observes the memory-pressure notifications and # forces a garbage collection and cycle collection when it happens, if the # appropriate pref is set. - name: javascript.options.gc_on_memory_pressure type: bool # Disable the JS engine's GC on memory pressure on Android for now to continue investigating its # performance impacts and then decide to enable it or not. # See bug 1450787. value: @IS_NOT_ANDROID@ mirror: always # We allow at most MIN(max, MAX(NUM_CPUS / cpu_divisor, 1)) concurrent GCs # between processes - name: javascript.options.concurrent_multiprocess_gcs.cpu_divisor type: RelaxedAtomicUint32 value: 4 mirror: always # See 'cpu_divisor' above, 0 means UINT_32_MAX. - name: javascript.options.concurrent_multiprocess_gcs.max type: RelaxedAtomicUint32 value: 0 mirror: always - name: javascript.options.mem.log type: bool value: false mirror: always - name: javascript.options.mem.notify type: bool value: false mirror: always # Whether the Parent process allocates and shares memory with all content # processes. This is mirrored once, as the parent process will do this # allocation early on. - name: javascript.options.self_hosted.use_shared_memory type: bool value: true mirror: always # LoadStartupJSPrefs do_not_use_directly: true - name: javascript.options.main_thread_stack_quota_cap type: uint32_t #if defined(MOZ_ASAN) value: 6 * 1024 * 1024 #else value: 2 * 1024 * 1024 #endif mirror: always - name: javascript.options.wasm_disable_huge_memory type: bool value: false mirror: always set_spidermonkey_pref: startup - name: javascript.options.wasm_optimizingjit type: bool value: true mirror: always - name: javascript.options.wasm_relaxed_simd type: bool #if defined(ENABLE_WASM_RELAXED_SIMD) value: @IS_NIGHTLY_BUILD@ #else value: false #endif mirror: always set_spidermonkey_pref: always - name: javascript.options.wasm_moz_intgemm type: bool #if defined(ENABLE_WASM_MOZ_INTGEMM) value: @IS_NIGHTLY_BUILD@ #else value: false #endif mirror: always set_spidermonkey_pref: startup - name: javascript.options.wasm_exnref type: bool value: true mirror: always set_spidermonkey_pref: startup - name: javascript.options.wasm_gc type: bool #if defined(ENABLE_WASM_GC) value: true #else value: false #endif mirror: always set_spidermonkey_pref: always - name: javascript.options.wasm_memory_control type: bool value: false mirror: always set_spidermonkey_pref: always - name: javascript.options.wasm_branch_hinting type: bool #if defined(ENABLE_WASM_BRANCH_HINTING) value: @IS_NIGHTLY_BUILD@ #else value: false #endif mirror: always set_spidermonkey_pref: always #if defined(ENABLE_WASM_SIMD) #if defined(JS_CODEGEN_X64) || defined(JS_CODEGEN_X86) # Enables AVX instructions support on X86/X64 platforms. # Changing these prefs requires a restart. - name: javascript.options.wasm_simd_avx type: bool value: true mirror: always set_spidermonkey_pref: startup #endif #endif - name: javascript.options.wasm_memory64 type: bool #if defined(ENABLE_WASM_MEMORY64) value: true #else value: false #endif mirror: always set_spidermonkey_pref: always - name: javascript.options.wasm_multi_memory type: bool #if defined(ENABLE_WASM_MULTI_MEMORY) value: true #else value: false #endif mirror: always set_spidermonkey_pref: always - name: javascript.options.wasm_js_string_builtins type: bool value: true mirror: always set_spidermonkey_pref: always - name: javascript.options.wasm_tail_calls type: bool #if defined(ENABLE_WASM_TAIL_CALLS) value: true #else value: false #endif mirror: always set_spidermonkey_pref: always - name: javascript.options.wasm_js_promise_integration type: bool value: false mirror: always set_spidermonkey_pref: always - name: javascript.options.wasm_test_serialization type: bool value: false mirror: always set_spidermonkey_pref: always # Enables lazy tiering for wasm modules that have a GC type defined in them. # Use wasm_lazy_tiering to enable it for any module. - name: javascript.options.wasm_lazy_tiering_for_gc type: bool value: true mirror: always set_spidermonkey_pref: always # Enables lazy tiering for all modules. Use wasm_lazy_tiering_for_gc to only # enable this for GC modules. - name: javascript.options.wasm_lazy_tiering type: bool value: false mirror: always set_spidermonkey_pref: always # Aggressiveness of lazy tiering, allowable: 1 .. 9 # 1 = min (almost never, set tiering threshold to max possible, == 2^31-1) # 9 = max (request tier up at first call, set tiering threshold to zero) - name: javascript.options.wasm_lazy_tiering_level type: uint32_t value: 5 mirror: always set_spidermonkey_pref: always # Forces lazy tiering to synchronously compile instead of using a background # thread. - name: javascript.options.wasm_lazy_tiering_synchronous type: bool value: false mirror: always set_spidermonkey_pref: always # Aggressiveness of inlining (regardless of call kind), allowable: 1 .. 9 - name: javascript.options.wasm_inlining_level type: uint32_t value: 5 mirror: always set_spidermonkey_pref: always # Are wasm direct calls (within same Instance) candidates for inlining? - name: javascript.options.wasm_direct_inlining type: bool value: true mirror: always set_spidermonkey_pref: always # Are wasm call_ref calls (within same Instance) candidates for inlining? - name: javascript.options.wasm_call_ref_inlining type: bool value: true mirror: always set_spidermonkey_pref: always # When selecting call_ref targets for speculative inlining, this is the minimum # percentage of the total number of calls from the call site that a candidate # set of targets must collectively have in order to be elegible for inlining. # Allowable: 10 .. 100 (%). Setting it (eg) 75 means the targets must collectively # be 75% of all observed calls to be considered for inlining. Probably unwise to # let this be much below 40. - name: javascript.options.wasm_call_ref_inlining_percent type: uint32_t value: 40 mirror: always set_spidermonkey_pref: always # Support for pretenuring allocations based on their allocation site. - name: javascript.options.site_based_pretenuring type: bool value: true mirror: always do_not_use_directly: true set_spidermonkey_pref: startup #if defined(DEBUG) || defined(NIGHTLY_BUILD) || defined(JS_GC_ZEAL) # Enable extra poisoning of GC memory. - name: javascript.options.extra_gc_poisoning type: bool #ifdef DEBUG value: true #else value: false #endif mirror: always set_spidermonkey_pref: startup #endif #if !defined(JS_CODEGEN_MIPS32) && !defined(JS_CODEGEN_MIPS64) && !defined(JS_CODEGEN_LOONG64) # Spectre security vulnerability mitigations for the JS JITs. # # NOTE: The MIPS and LoongArch backends do not support these mitigations (and generally # do not need them). In that case, leave the pref unlisted with its # default value of false. - name: javascript.options.spectre.index_masking type: bool value: true mirror: always # LoadStartupJSPrefs do_not_use_directly: true - name: javascript.options.spectre.object_mitigations type: bool value: true mirror: always # LoadStartupJSPrefs do_not_use_directly: true - name: javascript.options.spectre.string_mitigations type: bool value: true mirror: always # LoadStartupJSPrefs do_not_use_directly: true - name: javascript.options.spectre.value_masking type: bool value: true mirror: always # LoadStartupJSPrefs do_not_use_directly: true - name: javascript.options.spectre.jit_to_cxx_calls type: bool value: false mirror: always # LoadStartupJSPrefs do_not_use_directly: true #endif // !defined(JS_CODEGEN_MIPSXX) && !defined(JS_CODEGEN_LOONG64) # Separate pref to override the values of the Spectre-related prefs above for # isolated web content processes, where we don't need these mitigations. - name: javascript.options.spectre.disable_for_isolated_content type: bool value: true mirror: always # Whether the W^X policy is enforced to mark JIT code pages as either writable # or executable but never both at the same time. OpenBSD defaults to W^X. - name: javascript.options.content_process_write_protect_code type: bool #if defined(XP_OPENBSD) value: true #else value: false #endif mirror: always # Whether to use the XPCOM thread pool for JS helper tasks. - name: javascript.options.external_thread_pool type: bool value: true mirror: always do_not_use_directly: true # Whether to use the off-thread script compilation and decoding. - name: javascript.options.parallel_parsing type: bool value: true mirror: always # Whether to use fdlibm for Math.sin, Math.cos, and Math.tan. When # privacy.resistFingerprinting is true, this pref is ignored and fdlibm is used # anyway. - name: javascript.options.use_fdlibm_for_sin_cos_tan type: bool #if defined(XP_WIN) value: false #else value: true #endif mirror: always set_spidermonkey_pref: always # Whether to support parsing '//(#@) source(Mapping)?URL=' pragmas. - name: javascript.options.source_pragmas type: bool value: true mirror: always # asm.js - name: javascript.options.asmjs type: bool value: true mirror: always # Whether to throw a TypeError if asm.js code hits validation failure. - name: javascript.options.throw_on_asmjs_validation_failure type: bool value: false mirror: always # Whether to disable the jit within the main process - name: javascript.options.main_process_disable_jit type: bool #ifdef XP_IOS value: true #else value: false #endif mirror: always #--------------------------------------------------------------------------- # Prefs starting with "layers." #--------------------------------------------------------------------------- # Whether to disable acceleration for all widgets. - name: layers.acceleration.disabled type: bool value: false mirror: once do_not_use_directly: true # Instead, use gfxConfig::IsEnabled(Feature::HW_COMPOSITING). # Whether to force acceleration on, ignoring blacklists. - name: layers.acceleration.force-enabled type: bool value: false mirror: once do_not_use_directly: true # Whether we allow AMD switchable graphics. - name: layers.amd-switchable-gfx.enabled type: bool value: true mirror: once # Whether to use async panning and zooming. - name: layers.async-pan-zoom.enabled type: bool value: true mirror: once do_not_use_directly: true - name: layers.d3d11.force-warp type: bool value: false mirror: once - name: layers.d3d11.enable-blacklist type: bool value: true mirror: once # Enable DEAA antialiasing for transformed layers in the compositor. - name: layers.deaa.enabled type: RelaxedAtomicBool #if defined(MOZ_WIDGET_ANDROID) value: false #else value: true #endif mirror: always # Force all possible layers to be always active layers. - name: layers.force-active type: bool value: false mirror: always - name: layers.draw-mask-debug type: RelaxedAtomicBool value: false mirror: always - name: layers.force-synchronous-resize type: RelaxedAtomicBool #ifdef MOZ_WAYLAND # We want to control it by nsWindow::SynchronouslyRepaintOnResize() on Linux/Wayland. value: false #else value: true #endif mirror: always - name: layers.gpu-process.allow-software type: bool #if defined(XP_WIN) value: true #else value: false #endif mirror: once - name: layers.gpu-process.enabled type: bool #if defined(XP_WIN) || defined(MOZ_WIDGET_ANDROID) value: true #elif defined(MOZ_X11) value: false # we'd like this to be @IS_NIGHTLY_BUILD@, see Bug 1927058 #else value: false #endif mirror: once - name: layers.gpu-process.force-enabled type: bool value: false mirror: once - name: layers.gpu-process.ipc_reply_timeout_ms type: int32_t value: 10000 mirror: once - name: layers.gpu-process.extend_ipc_reply_timeout_ms type: int32_t value: 20000 mirror: once # How many unstable GPU process restarts we allow for a given configuration. - name: layers.gpu-process.max_restarts type: RelaxedAtomicInt32 #if defined(XP_WIN) || defined(MOZ_WIDGET_GTK) || defined(MOZ_WIDGET_ANDROID) value: 6 #else value: 1 #endif mirror: always # How many frames we must render before declaring the GPU process stable, and # allow restarts without it counting against our maximum restarts. - name: layers.gpu-process.stable.frame-threshold type: RelaxedAtomicUint32 value: 10 mirror: always # How many milliseconds the GPU process must have lived before we accept that # it is stable, and allow restarts without it counting against our maximum # restarts. - name: layers.gpu-process.stable.min-uptime-ms type: RelaxedAtomicInt32 value: 4 * 60000 mirror: always # Note: This pref will only be used if it is less than layers.gpu-process.max_restarts. - name: layers.gpu-process.max_restarts_with_decoder type: RelaxedAtomicInt32 value: 0 mirror: always - name: layers.gpu-process.startup_timeout_ms type: int32_t value: 5000 mirror: once - name: layers.gpu-process.crash-also-crashes-browser type: bool value: false mirror: always # Whether to animate simple opacity and transforms on the compositor. - name: layers.offmainthreadcomposition.async-animations type: bool value: true mirror: always # Whether to log information about off main thread animations to stderr. - name: layers.offmainthreadcomposition.log-animations type: bool value: false mirror: always - name: layers.offmainthreadcomposition.force-disabled type: bool value: false mirror: once # Compositor target frame rate. NOTE: If vsync is enabled the compositor # frame rate will still be capped. # -1 -> default (match layout.frame_rate or 60 FPS) # 0 -> full-tilt mode: Recomposite even if not transaction occured. - name: layers.offmainthreadcomposition.frame-rate type: RelaxedAtomicInt32 value: -1 mirror: always #ifdef XP_WIN - name: layers.prefer-opengl type: bool value: false mirror: once #endif # Copy-on-write canvas. - name: layers.shared-buffer-provider.enabled type: RelaxedAtomicBool value: true mirror: always - name: layers.recycle-allocator-rdd type: bool value: true mirror: once - name: layers.iosurfaceimage.recycle-limit type: RelaxedAtomicUint32 value: 15 mirror: always #--------------------------------------------------------------------------- # Prefs starting with "layout." #--------------------------------------------------------------------------- # Debug-only pref to force enable the AccessibleCaret. If you want to # control AccessibleCaret by mouse, you'll need to set # "layout.accessiblecaret.hide_carets_for_mouse_input" to false. - name: layout.accessiblecaret.enabled type: bool value: false mirror: always # Enable the accessible caret on platforms/devices # that we detect have touch support. Note that this pref is an # additional way to enable the accessible carets, rather than # overriding the layout.accessiblecaret.enabled pref. - name: layout.accessiblecaret.enabled_on_touch type: bool value: true mirror: always # By default, carets become tilt only when they are overlapping. - name: layout.accessiblecaret.always_tilt type: bool value: false mirror: always # Show caret in cursor mode when long tapping on an empty content. This # also changes the default update behavior in cursor mode, which is based # on the emptiness of the content, into something more heuristic. See # AccessibleCaretManager::UpdateCaretsForCursorMode() for the details. - name: layout.accessiblecaret.caret_shown_when_long_tapping_on_empty_content type: bool value: false mirror: always # 0 = by default, always hide carets for selection changes due to JS calls. # 1 = update any visible carets for selection changes due to JS calls, # but don't show carets if carets are hidden. # 2 = always show carets for selection changes due to JS calls. - name: layout.accessiblecaret.script_change_update_mode type: int32_t value: 0 mirror: always # Allow one caret to be dragged across the other caret without any limitation. # This matches the built-in convention for all desktop platforms. - name: layout.accessiblecaret.allow_dragging_across_other_caret type: bool value: true mirror: always # Optionally provide haptic feedback on long-press selection events. - name: layout.accessiblecaret.hapticfeedback type: bool value: false mirror: always # Smart phone-number selection on long-press is not enabled by default. - name: layout.accessiblecaret.extend_selection_for_phone_number type: bool value: false mirror: always # Keep the accessible carets hidden when the user is using mouse input (as # opposed to touch/pen/etc.). - name: layout.accessiblecaret.hide_carets_for_mouse_input type: bool value: true mirror: always # CSS attributes (width, height, margin-left) of the AccessibleCaret in CSS # pixels. - name: layout.accessiblecaret.width type: float value: 34.0f mirror: always - name: layout.accessiblecaret.height type: float value: 36.0f mirror: always - name: layout.accessiblecaret.margin-left type: float value: -18.5f mirror: always - name: layout.accessiblecaret.transition-duration type: float value: 250.0f mirror: always # Simulate long tap events to select words. Mainly used in manual testing # with mouse. - name: layout.accessiblecaret.use_long_tap_injector type: bool value: false mirror: always # To support magnify glass, whether we dispatch additional chrome event such as # dragcaret. - name: layout.accessiblecaret.magnifier.enabled type: bool value: @IS_ANDROID@ mirror: always # One of several prefs affecting the maximum area to pre-render when animating # a large element on the compositor. # This pref enables transform (and transform like properties) animations on a # large element run on the compositor with rendering partial area of the # element on the main thread instead of rendering the whole area. Once the # animation tried to composite out of the partial rendered area, the animation # is rendered again with the latest visible partial area. - name: layout.animation.prerender.partial type: RelaxedAtomicBool value: false mirror: always # One of several prefs affecting the maximum area to pre-render when animating # a large element on the compositor. # This value is applied to both x and y axes and a perfect square contructed # by the greater axis value which will be capped by the absolute limits is used # for the partial pre-render area. - name: layout.animation.prerender.viewport-ratio-limit type: AtomicFloat value: 1.125f mirror: always # One of several prefs affecting the maximum area to pre-render when animating # a large element on the compositor. - name: layout.animation.prerender.absolute-limit-x type: RelaxedAtomicUint32 value: 4096 mirror: always # One of several prefs affecting the maximum area to pre-render when animating # a large element on the compositor. - name: layout.animation.prerender.absolute-limit-y type: RelaxedAtomicUint32 value: 4096 mirror: always # Test-only pref, if this is true, partial pre-rendered transform animations # get stuck when it reaches to the pre-rendered boundaries and the pre-render # region is never updated. - name: layout.animation.prerender.partial.jank type: RelaxedAtomicBool value: false mirror: always # Whether to enable CSS Anchor Positioning support. # https://drafts.csswg.org/css-anchor-position-1/ - name: layout.css.anchor-positioning.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # Override DPI. A value of -1 means use the maximum of 96 and the system DPI. # A value of 0 means use the system DPI. A positive value is used as the DPI. # This sets the physical size of a device pixel and thus controls the # interpretation of physical units such as "pt". - name: layout.css.dpi type: int32_t value: -1 mirror: always # Whether to always underline links. - name: layout.css.always_underline_links type: RelaxedAtomicBool value: false mirror: always rust: true # Whether to respect align-content on blocks. - name: layout.css.align-content.blocks.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Whether content-box and stroke-box are enabled for transform-box. - name: layout.css.transform-box-content-stroke.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Whether transition-behavior property is enabled? - name: layout.css.transition-behavior.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Whether @starting-style is enabled? - name: layout.css.starting-style-at-rules.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Should we look for counter ancestor scopes first? - name: layout.css.counter-ancestor-scope.enabled type: bool value: true mirror: always # Whether the `-moz-control-character-visibility` property is exposed to # content. # # Only for testing purposes. - name: layout.css.moz-control-character-visibility.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # Whether the `-moz-user-input` property is exposed to content. - name: layout.css.moz-user-input.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # This pref controls whether the `prefers-color-scheme` value of iframes images # reacts to the embedder `color-scheme` in content. - name: layout.css.iframe-embedder-prefers-color-scheme.content.enabled type: RelaxedAtomicBool value: true mirror: always # Controls the transparency of the initial about:blank document. Generally you # don't ever want a white flash in dark mode, but due to backwards compat we # have some extra control over this, for now at least. # # See https://github.com/w3c/csswg-drafts/issues/9624 for iframes. # # Values: # 1: content-inaccessible top-level only. # 2: frames and content-inaccessible top-level only. # 3: always # Others: don't treat this document specially. - name: layout.css.initial-document-transparency type: RelaxedAtomicInt32 value: 3 mirror: always # The minimum contrast ratio between the accent color background and white. # # We don't use this for text, so we need a contrast of at least AA (for user # interface components and graphical objects), which per WCAG is 3:1. # # However that causes some colors that are realistically fine to get darkened, # so we lower it a little bit. Eventually we should maybe use something like # APCA or so perhaps, see: # # * https://ruitina.com/apca-accessible-colour-contrast/ # * https://github.com/w3c/csswg-drafts/issues/7937 # # See also: # # * https://accent-color.glitch.me/ # # For testing this. - name: layout.css.accent-color.min-contrast-ratio type: AtomicFloat value: 2.4 mirror: always # The target contrast ratio between the accent color foreground and background # colors when darkening. # # We aim a bit further than the minimum contrast ratio, which seems to provide # nice results in practice. - name: layout.css.accent-color.darkening-target-contrast-ratio type: AtomicFloat value: 6.0 mirror: always # Whether the `animation-composition` in css-animations-2 is enabled. - name: layout.css.animation-composition.enabled type: bool value: true mirror: always # Is the codepath for using cached scrollbar styles enabled? - name: layout.css.cached-scrollbar-styles.enabled type: bool value: true mirror: always # Whether computed local-fragment-only image urls serialize using the same # rules as filter/mask/etc (not resolving the URL for local refs). # # See https://github.com/w3c/csswg-drafts/issues/3195 - name: layout.css.computed-style.dont-resolve-image-local-refs type: RelaxedAtomicBool value: true mirror: always rust: true # Are implicit tracks in computed grid templates serialized? - name: layout.css.serialize-grid-implicit-tracks type: RelaxedAtomicBool value: true mirror: always # Whether the system-ui generic family is enabled. - name: layout.css.system-ui.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Set the number of device pixels per CSS pixel. A value <= 0 means choose # automatically based on user settings for the platform (e.g., "UI scale factor" # on Mac). If browser.display.os-zoom-behavior == 1, then a positive value # will be multiplied by the text scale factor; otherwise a positive value is # used as-is. This controls the size of a CSS "px" at 100% full-zoom. # The size of system fonts is also changed in proportion with the change in # "px" sizes. Use "ui.textScaleFactor" instead to only change the size of "px". # This is only used for windows on the screen, not for printing. - name: layout.css.devPixelsPerPx type: AtomicFloat value: -1.0f mirror: always # Is support for CSS backdrop-filter enabled? - name: layout.css.backdrop-filter.enabled type: bool value: true mirror: always # Do we override the blocklist for CSS backdrop-filter? - name: layout.css.backdrop-filter.force-enabled type: bool value: false mirror: always # Is support for rect() enabled? - name: layout.css.basic-shape-rect.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Is support for shape() enabled? - name: layout.css.basic-shape-shape.enabled type: RelaxedAtomicBool value: @IS_NIGHTLY_BUILD@ mirror: always rust: true # Is support for xywh() enabled? - name: layout.css.basic-shape-xywh.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Whether alt text in content is enabled. - name: layout.css.content.alt-text.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Should stray control characters be rendered visibly? - name: layout.css.control-characters.visible type: RelaxedAtomicBool value: @IS_NOT_RELEASE_OR_BETA@ mirror: always rust: true # Whether the `contain-intrinsic-size` CSS property is enabled - name: layout.css.contain-intrinsic-size.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Is support for GeometryUtils.convert*FromNode enabled? - name: layout.css.convertFromNode.enabled type: bool value: @IS_NOT_RELEASE_OR_BETA@ mirror: always - name: layout.css.cross-fade.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # Is support for light-dark() on content enabled? - name: layout.css.light-dark.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Is support for fit-content() enabled? - name: layout.css.fit-content-function.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # Whether to use tight bounds for floating ::first-letter (legacy Gecko behavior) # or loose bounds based on overall font metrics (WebKit/Blink-like behavior)? # Values mean: # 1 legacy Gecko behavior (tight bounds) # 0 loose typographic bounds (similar to webkit/blink) # -1 auto behavior: use loose bounds if reduced line-height (<1em) or negative # block-start margin is present; otherwise use tight bounds. - name: layout.css.floating-first-letter.tight-glyph-bounds type: int32_t #ifdef NIGHTLY_BUILD value: -1 #else value: 1 #endif mirror: always # Is support for the @font-palette-values rule and font-palette property enabled? - name: layout.css.font-palette.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Is support for variation fonts enabled? - name: layout.css.font-variations.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Is support for the size-adjust @font-face descriptor enabled? - name: layout.css.size-adjust.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Is support for the tech() function in the @font-face src descriptor enabled? - name: layout.css.font-tech.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Is support for font-variant-emoji enabled? - name: layout.css.font-variant-emoji.enabled type: RelaxedAtomicBool value: @IS_NIGHTLY_BUILD@ mirror: always rust: true # Visibility level of font families available to CSS font-matching: # 1 - only base system fonts # 2 - also fonts from optional language packs # 3 - also user-installed fonts - name: layout.css.font-visibility type: int32_t value: 3 mirror: always # Is support for GeometryUtils.getBoxQuads enabled? - name: layout.css.getBoxQuads.enabled type: bool value: @IS_NOT_RELEASE_OR_BETA@ mirror: always # Is support for (linear|radial|conic)-gradient color interpolation methods enabled? - name: layout.css.gradient-color-interpolation-method.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Should we propagate baseline alignment information from a parent grid into # its subgrids? - name: layout.css.grid-subgrid-baselines.enabled type: RelaxedAtomicBool value: @IS_NIGHTLY_BUILD@ mirror: always # Is support for CSS masonry layout enabled? - name: layout.css.grid-template-masonry-value.enabled type: RelaxedAtomicBool value: @IS_NIGHTLY_BUILD@ mirror: always rust: true # Is support for :has() enabled? - name: layout.css.has-selector.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Whether the `:has-slotted` pseudo class is enabled - name: layout.css.has-slotted-selector.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # Is support for CSS initial-letter property enabled? - name: layout.css.initial-letter.enabled type: bool value: false mirror: always # Is eager first-letter processing during intrinsic size computation enabled? - name: layout.css.intrinsic-size-first-letter.enabled type: bool value: true mirror: always # Which model to use for CSS letter-spacing: # 0 - Gecko legacy model, spacing added to trailing side of letter # 1 - WebKit/Blink-compatible, spacing always added to right-hand side # 2 - Symmetrical spacing, half added to each side - name: layout.css.letter-spacing.model type: int32_t #if defined(MOZ_DEV_EDITION) || defined(EARLY_BETA_OR_EARLIER) value: 2 #else value: 0 #endif mirror: always # Is support for motion-path url enabled? - name: layout.css.motion-path-url.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Pref to control whether the ::marker property restrictions defined in [1] # apply. # # [1]: https://drafts.csswg.org/css-pseudo-4/#selectordef-marker - name: layout.css.marker.restricted type: RelaxedAtomicBool value: true mirror: always rust: true # Is -moz-osx-font-smoothing enabled? (Only supported in OSX builds) - name: layout.css.osx-font-smoothing.enabled type: bool #if defined(XP_MACOSX) value: true #else value: false #endif mirror: always # Is support for CSS overflow-clip-box enabled for non-UA sheets? - name: layout.css.overflow-clip-box.enabled type: bool value: false mirror: always # Is support for CSS overflow: -moz-hidden-unscrollable enabled - name: layout.css.overflow-moz-hidden-unscrollable.enabled type: RelaxedAtomicBool value: @IS_NOT_NIGHTLY_BUILD@ mirror: always rust: true # Is support for overscroll-behavior enabled? - name: layout.css.overscroll-behavior.enabled type: bool value: true mirror: always # Enables support for the page-orientation property inside of CSS @page rules. - name: layout.css.page-orientation.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Enables support for different CSS page sizes on each page when printing. - name: layout.css.allow-mixed-page-sizes type: RelaxedAtomicBool value: true mirror: always # Enables support for @margin rules. - name: layout.css.margin-rules.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # Whether Properties and Values is enabled - name: layout.css.properties-and-values.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Whether @scope rule is enabled - name: layout.css.at-scope.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # An override for prefers-color-scheme for content documents. # 0: Dark # 1: Light # 2: Auto (system color scheme unless overridden by browser theme) - name: layout.css.prefers-color-scheme.content-override type: RelaxedAtomicInt32 value: 2 mirror: always # Dictates whether or not the prefers-reduced-transparency media query is enabled. - name: layout.css.prefers-reduced-transparency.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # Dictates whether or not the inverted-colors media query is enabled. - name: layout.css.inverted-colors.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # Is support for -moz-prefixed animation properties enabled? - name: layout.css.prefixes.animations type: bool value: true mirror: always # Is support for -moz-border-image enabled? - name: layout.css.prefixes.border-image type: bool value: true mirror: always # Is support for -moz-box-sizing enabled? - name: layout.css.prefixes.box-sizing type: bool value: true mirror: always # Is support for -moz-prefixed font feature properties enabled? - name: layout.css.prefixes.font-features type: bool value: true mirror: always # Is support for -moz-prefixed transform properties enabled? - name: layout.css.prefixes.transforms type: bool value: true mirror: always # Is support for -moz-prefixed transition properties enabled? - name: layout.css.prefixes.transitions type: bool value: false mirror: always # Enable relative color syntax: https://drafts.csswg.org/css-color-5/#relative-colors - name: layout.css.relative-color-syntax.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Is CSS error reporting enabled? - name: layout.css.report_errors type: bool value: true mirror: always # Are inter-character ruby annotations enabled? - name: layout.css.ruby.intercharacter.enabled type: bool value: false mirror: always - name: layout.css.scroll-behavior.damping-ratio type: AtomicFloat value: 1.0f mirror: always # Tuning of the smooth scroll motion used by CSSOM-View scroll-behavior. # Spring-constant controls the strength of the simulated MSD # (Mass-Spring-Damper). - name: layout.css.scroll-behavior.spring-constant type: AtomicFloat value: 250.0f mirror: always # Whether the scroll-driven animations generated by CSS is enabled. This # also include animation-timeline property. - name: layout.css.scroll-driven-animations.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # When selecting the snap point for CSS scroll snapping, the velocity of the # scroll frame is clamped to this speed, in CSS pixels / s. - name: layout.css.scroll-snap.prediction-max-velocity type: RelaxedAtomicInt32 value: 2000 mirror: always # When selecting the snap point for CSS scroll snapping, the velocity of the # scroll frame is integrated over this duration, in seconds. The snap point # best suited for this position is selected, enabling the user to perform fling # gestures. - name: layout.css.scroll-snap.prediction-sensitivity type: AtomicFloat value: 0.750f mirror: always # Stylo thread-pool size. # Negative means auto, 0 disables the thread-pool (main-thread styling), other # numbers override as specified. # Note that 1 still creates a thread-pool of one thread! - name: layout.css.stylo-threads type: RelaxedAtomicInt32 value: -1 mirror: always rust: true # Stylo work unit size. This is the amount of nodes we'll process in a single # unit of work of the thread-pool. # # Larger values will increase style sharing cache hits and general DOM locality # at the expense of decreased opportunities for parallelism. There are some # measurements in bug 1385982 comments 11, 12, 13 that investigate some # slightly different values for the work unit size. # # If the size is significantly increased, make sure to also review # stylo-local-work-queue prefs, since we might end up doing too much work # sequentially. # # A value of 0 disables parallelism altogether. - name: layout.css.stylo-work-unit-size type: RelaxedAtomicUint32 value: 16 mirror: always rust: true # The minimum amount of work that a thread doing styling will try to keep # locally before sending work to other threads, in a worker. - name: layout.css.stylo-local-work-queue.in-worker type: RelaxedAtomicUint32 value: 0 mirror: always rust: true # As above but for the main thread. The main thread can't really steal from # other threads so it might want a bigger min queue size before giving work to # other threads. - name: layout.css.stylo-local-work-queue.in-main-thread type: RelaxedAtomicUint32 value: 32 mirror: always rust: true # Are counters for implemented CSS properties enabled? - name: layout.css.use-counters.enabled type: bool value: true mirror: always # Are counters for unimplemented CSS properties enabled? - name: layout.css.use-counters-unimplemented.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Should the :visited selector ever match (otherwise :link matches instead)? - name: layout.css.visited_links_enabled type: bool value: true mirror: always # The margin used for detecting relevancy for `content-visibility: auto`. - name: layout.css.content-visibility-relevant-content-margin type: float value: 50 # 50% mirror: always # Whether the `hanging` and `each-line` keywords are supported by `text-indent` - name: layout.css.text-indent-keywords.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Whether the "modern" uppercase mapping of ß to ẞ (rather than SS) is used. - name: layout.css.text-transform.uppercase-eszett.enabled type: bool value: false mirror: always - name: layout.css.text-wrap-balance.enabled type: bool value: true mirror: always # Maximum number of lines to try balancing. - name: layout.css.text-wrap-balance.limit type: int32_t value: 10 mirror: always - name: layout.css.text-wrap-balance-after-clamp.enabled type: bool value: true mirror: always - name: layout.css.text-align.justify-only-after-last-tab type: bool value: true mirror: always # Support for the css Zoom property. - name: layout.css.zoom.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # UA styles for h1 in article/aside/nav/section. See bug 1883896. - name: layout.css.h1-in-section-ua-styles.enabled type: RelaxedAtomicBool value: @IS_NOT_NIGHTLY_BUILD@ mirror: always # The maximum width or height of the cursor we should allow when intersecting # the UI, in CSS pixels. - name: layout.cursor.block.max-size type: uint32_t value: 32 mirror: always - name: layout.cursor.disable-for-popups type: bool value: true mirror: always - name: layout.display-list.build-twice type: RelaxedAtomicBool value: false mirror: always # Toggle retaining display lists between paints. - name: layout.display-list.retain type: RelaxedAtomicBool value: true mirror: always # Toggle retaining display lists between paints. - name: layout.display-list.retain.chrome type: RelaxedAtomicBool value: true mirror: always - name: layout.display-list.retain.sc type: RelaxedAtomicBool value: false mirror: always # Set the maximum number of modified frames allowed before doing a full # display list rebuild. - name: layout.display-list.rebuild-frame-limit type: RelaxedAtomicUint32 value: 500 mirror: always # Pref to dump the display list to the log. Useful for debugging drawing. - name: layout.display-list.dump type: RelaxedAtomicBool value: false mirror: always # Pref to dump the display list to the log. Useful for debugging drawing. - name: layout.display-list.dump-content type: RelaxedAtomicBool value: false mirror: always # Pref to dump the display list to the log. Useful for debugging drawing. - name: layout.display-list.dump-parent type: RelaxedAtomicBool value: false mirror: always - name: layout.display-list.show-rebuild-area type: RelaxedAtomicBool value: false mirror: always - name: layout.display-list.improve-fragmentation type: RelaxedAtomicBool value: true mirror: always # Are dynamic reflow roots enabled? - name: layout.dynamic-reflow-roots.enabled type: bool value: @IS_EARLY_BETA_OR_EARLIER@ mirror: always # Enables the mechanism to optimize away flex item's final reflow. # Warning: Disabling the pref will impact the performance. This is useful only for # debugging flexbox issues. - name: layout.flexbox.item-final-reflow-optimization.enabled type: bool value: true mirror: always # Enables the custom layout frame with a clear icon. # Still needs tests and a web-exposed way to remove that icon, see bug 1654288. - name: layout.forms.input-type-search.enabled type: bool value: false mirror: always # Enables the Reveal Password button inside a . - name: layout.forms.reveal-password-button.enabled type: bool value: false mirror: always # If enabled, textareas won't include 'overflow:auto' scrollbars in their # block-axis size (usually height). - name: layout.forms.textarea-sizing-excludes-auto-scrollbar.enabled type: bool value: true mirror: always # Pref to control browser frame rate, in Hz. A value <= 0 means choose # automatically based on knowledge of the platform (or 60Hz if no platform- # specific information is available). - name: layout.frame_rate type: RelaxedAtomicInt32 value: -1 mirror: always # If it has been this many frame periods since a refresh, assume that painting # is quiescent (will not happen again soon). - name: layout.idle_period.required_quiescent_frames type: uint32_t value: 2 mirror: always # The amount of time (milliseconds) needed between an idle period's # end and the start of the next tick to avoid jank. - name: layout.idle_period.time_limit type: uint32_t value: 1 mirror: always # The minimum amount of time (milliseconds) required to be remaining # in the current vsync interval for us to attempt an extra tick, or # <0 to disable extra ticks entirely. - name: layout.extra-tick.minimum-ms type: int32_t value: 4 mirror: always # Whether to load the broken image icon eagerly. This is mostly needed for # reftests, since the broken image icon doesn't block the load event and thus # there's no easy way to guarantee it's loaded. - name: layout.image.eager_broken_image_icon type: bool value: false mirror: always # Enable/disable interruptible reflow, which allows reflows to stop # before completion (and display the partial results) when user events # are pending. - name: layout.interruptible-reflow.enabled type: bool value: true mirror: always # On Android, don't synth mouse move events after scrolling, as they cause # unexpected user-visible behaviour. Can remove this after bug 1633450 is # satisfactorily resolved. - name: layout.reflow.synthMouseMove type: bool value: @IS_NOT_ANDROID@ mirror: always # This pref determines which side vertical scrollbars should be on. # 0 = end-side in UI direction # 1 = end-side in document/content direction # 2 = right # 3 = left - name: layout.scrollbar.side type: int32_t value: 0 mirror: always # This pref is to be set by test code only. - name: layout.scrollbars.always-layerize-track type: RelaxedAtomicBool value: false mirror: always - name: layout.scrollbars.click_and_hold_track.continue_to_end type: bool # On Linux, click-and-hold on the scrollbar track should continue scrolling # until the mouse is released. On the other platforms we want to stop # scrolling as soon as the scrollbar thumb has reached the current mouse # position. #ifdef MOZ_WIDGET_GTK value: true #else value: false #endif mirror: always # Whether anchor is kept selected. - name: layout.selectanchor type: bool value: false mirror: always # Controls caret style and word-delete during text selection. # 0: Use platform default # 1: Caret moves and blinks as when there is no selection; word # delete deselects the selection and then deletes word. # 2: Caret moves to selection edge and is not visible during selection; # word delete deletes the selection (Mac and Linux default). # 3: Caret moves and blinks as when there is no selection; word delete # deletes the selection. # Windows default is 1 for word delete behavior, the rest as for 2. - name: layout.selection.caret_style type: int32_t value: 0 mirror: always # If layout.show_previous_page is true then during loading of a new page we # will draw the previous page if the new page has painting suppressed. - name: layout.show_previous_page type: bool value: true mirror: always # Pref to stop overlay scrollbars from fading out, for testing purposes. - name: layout.testing.overlay-scrollbars.always-visible type: bool value: false mirror: always # Throttled frame rate, in frames per second. - name: layout.throttled_frame_rate type: uint32_t value: 1 mirror: always # Whether we should throttle in-process iframes in the active tab. - name: layout.throttle_in_process_iframes type: bool value: true mirror: always - name: layout.lower_priority_refresh_driver_during_load type: bool value: true mirror: always # If > 0, nsRefreshDriver will keep ticking this amount of milliseconds after # top level page load. - name: layout.keep_ticking_after_load_ms type: uint32_t value: 1000 mirror: always # Pref to control enabling scroll anchoring. - name: layout.css.scroll-anchoring.enabled type: bool value: true mirror: always # Pref to control whether to suspend also RefreshDriver::Tick when the page # itself is suspended because of some synchronous operation, like sync XHR. - name: layout.skip_ticks_while_page_suspended type: bool value: true mirror: always # Pref to control how many consecutive scroll-anchoring adjustments (since the # most recent user scroll or timeout) we'll average, before we consider whether # to automatically turn off scroll anchoring. When we hit this threshold, the # actual decision to disable also depends on the # min-average-adjustment-threshold pref, see below for more details. # # Zero disables the heuristic. - name: layout.css.scroll-anchoring.max-consecutive-adjustments type: uint32_t value: 10 mirror: always # Whether to reset counting the consecutive scroll-anchoring adjustments during # running async scrolling by APZ. - name: layout.css.scroll-anchoring.reset-heuristic-during-animation type: bool value: false mirror: always # The time after which we reset the max-consecutive-adjustments period, in # milliseconds. # # This prevents sporadic back-and-forth scroll anchoring to trigger the # max-consecutive-adjustments heuristic. - name: layout.css.scroll-anchoring.max-consecutive-adjustments-timeout-ms type: uint32_t value: 500 mirror: always # Pref to control whether we should disable scroll anchoring on a scroller # where at least max-consecutive-adjustments have happened, and which the # average adjustment ends up being less than this number, in CSS pixels. # # So, for example, given max-consecutive-adjustments=10 and # min-average-adjustment-treshold=3, we'll block scroll anchoring if there have # been 10 consecutive adjustments without a user scroll or more, and the # average offset difference between them amount to less than 3 CSS pixels. - name: layout.css.scroll-anchoring.min-average-adjustment-threshold type: uint32_t value: 2 mirror: always # Pref to control disabling scroll anchoring suppression triggers, see # # https://drafts.csswg.org/css-scroll-anchoring/#suppression-triggers # # Those triggers should be unnecessary after bug 1561450. - name: layout.css.scroll-anchoring.suppressions.enabled type: bool value: true mirror: always - name: layout.css.scroll-anchoring.highlight type: bool value: false mirror: always # Pref to control whether we reselect scroll anchors if sub-optimal # # See https://github.com/w3c/csswg-drafts/issues/6787 - name: layout.css.scroll-anchoring.reselect-if-suboptimal type: bool value: true mirror: always # Are shared memory User Agent style sheets enabled? - name: layout.css.shared-memory-ua-sheets.enabled type: bool value: true mirror: always # Is the CSS 'stretch' keyword enabled, for size-valued properties like 'width' # and 'height'? (Note: this is unrelated to the 'stretch' value for the # various alignment properties like 'align-self'; this pref has has # no influence on the 'stretch' keyword for those alignment properties.) - name: layout.css.stretch-size-keyword.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # Is the '-webkit-fill-available' keyword enabled, as an alias for 'stretch'? - name: layout.css.webkit-fill-available.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # Is support for -webkit-line-clamp on regular blocks enabled? - name: layout.css.webkit-line-clamp.block.enabled type: bool value: false mirror: always # Does webkit-line-clamp skip painting clamped lines? # See bug 1934547. - name: layout.css.webkit-line-clamp.skip-paint type: bool value: false mirror: always # Is 'content:none' supported on (non-pseudo) elements? - name: layout.css.element-content-none.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # Whether we want scrollbar-width: thin to behave as scrollbar-width: auto. - name: layout.css.scrollbar-width-thin.disabled type: RelaxedAtomicBool value: false mirror: always # field-sizing CSS property - name: layout.css.field-sizing.enabled type: RelaxedAtomicBool value: false mirror: always # Whether supports() conditions in @import is enabled - name: layout.css.import-supports.enabled type: RelaxedAtomicBool value: true mirror: always rust: true # Whether :-moz-broken is supported in content. - name: layout.css.moz-broken.content.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # Whether the modern ::slider-* pseudos are enabled. - name: layout.css.modern-range-pseudos.enabled type: RelaxedAtomicBool value: false mirror: always rust: true # Is matching video-dynamic-range: high allowed? - name: layout.css.video-dynamic-range.allows-high type: RelaxedAtomicBool #if defined(XP_MACOSX) value: true #else value: false #endif mirror: always # Whether frame visibility tracking is enabled globally. - name: layout.framevisibility.enabled type: bool value: true mirror: always # The fraction of the scrollport we allow to horizontally scroll by before we # schedule an update of frame visibility. - name: layout.framevisibility.amountscrollbeforeupdatehorizontal type: int32_t value: 2 mirror: always # The fraction of the scrollport we allow to vertically scroll by before we # schedule an update of frame visibility. - name: layout.framevisibility.amountscrollbeforeupdatevertical type: int32_t value: 2 mirror: always # The number of scrollports wide to expand when tracking frame visibility. - name: layout.framevisibility.numscrollportwidths type: uint32_t #ifdef ANDROID value: 1 #else value: 0 #endif mirror: always # The number of scrollports high to expand when tracking frame visibility. - name: layout.framevisibility.numscrollportheights type: uint32_t value: 1 mirror: always # Test only. - name: layout.dynamic-toolbar-max-height type: RelaxedAtomicInt32 value: 0 mirror: always # Whether outlines should include all overflowing descendants, or just the # border-box of a given element. # # Historically we have included descendants but other browsers have not. - name: layout.outline.include-overflow type: bool value: false mirror: always # Enable/disable overflow/underflow events in content - name: layout.overflow-underflow.content.enabled type: bool value: false mirror: always # Enable/disable overflow/underflow events in addon content - name: layout.overflow-underflow.content.enabled_in_addons type: bool value: false mirror: always - name: layout.visibility.min-recompute-interval-ms type: uint32_t value: 1000 mirror: always # Controls double click and Alt+Arrow word selection behavior. - name: layout.word_select.eat_space_to_next_word type: bool #ifdef XP_WIN value: true #else value: false #endif mirror: always - name: layout.word_select.stop_at_punctuation type: RelaxedAtomicBool value: true mirror: always # Whether underscore should be treated as a word-breaking character for # word selection/arrow-key movement purposes. - name: layout.word_select.stop_at_underscore type: bool value: false mirror: always # Whether to draw images in CSS backgrounds if we only have a partial frame. - name: layout.display_partial_background_images type: bool value: true mirror: always # Controls whether nsRefreshDriver::IsInHighRateMode() may ever return true. - name: layout.expose_high_rate_mode_from_refreshdriver type: bool value: true mirror: always # Whether
is forced to be a block, see bug 1856374 - name: layout.details.force-block-layout type: bool value: true mirror: always # Whether table cells can generate scroll boxes. - name: layout.tables.scrollable-cells type: bool value: false mirror: always # Whether to disable layer pixel alignment in scroll related stuff. - name: layout.scroll.disable-pixel-alignment type: RelaxedAtomicBool value: false mirror: always #--------------------------------------------------------------------------- # Prefs starting with "logging." #--------------------------------------------------------------------------- # If this pref is true, prefs in the logging.config branch will be cleared on # startup. This prevents unadvertedly creating huge log files that fill the disk # when forgetting to remove the logging preferences. - name: logging.config.clear_on_startup type: bool value: true mirror: never # Allow setting log modules at runtimes easily with a MOZ_LOG string. # This preference is empty by default but defined, this makes it easy to use # especially on mobile by searching for it in about:config. - name: logging.config.modules type: String value: "" mirror: never #--------------------------------------------------------------------------- # Prefs starting with "mathml." #--------------------------------------------------------------------------- # Whether to disable legacy names "thickmathspace", "mediummathspace", # "thickmathspace" etc for length attributes. - name: mathml.mathspace_names.disabled type: bool value: @IS_NIGHTLY_BUILD@ mirror: always # Whether to disable support for stretching operators with STIXGeneral fonts. # macos still has the deprecated STIXGeneral font pre-installed. - name: mathml.stixgeneral_operator_stretching.disabled type: bool value: true mirror: always # Whether to disable fallback for mathvariant=italic/bold/bold-italic via # styling when lacking proper fonts for Mathematical Alphanumeric Symbols. # We expect all OSes to have relevant fonts, except Android, see bug 1789083. - name: mathml.mathvariant_styling_fallback.disabled type: bool #if defined(ANDROID) value: false #else value: true #endif mirror: always # Whether to disable the MathML3 support for the mathvariant attribute. For # MathML Core, support is restricted to the element and to value "normal". # Corresponding automatic italicization on single-char element is also # implemented via text-transform: auto when that flag is enabled. - name: mathml.legacy_mathvariant_attribute.disabled type: bool value: @IS_NIGHTLY_BUILD@ mirror: always rust: true # Whether to disable forced centering of binary operators (+, =, ...). - name: mathml.centered_operators.disabled type: bool value: true mirror: always rust: true # Whether to disable extra top/bottom spacing for stretchy operators. - name: mathml.top_bottom_spacing_for_stretchy_operators.disabled type: bool value: true mirror: always rust: true #--------------------------------------------------------------------------- # Prefs starting with "media." #--------------------------------------------------------------------------- # This pref defines what the blocking policy would be used in blocking autoplay. # 0 : use sticky activation (default) # https://html.spec.whatwg.org/multipage/interaction.html#sticky-activation # 1 : use transient activation (the transient activation duration can be # adjusted by the pref `dom.user_activation.transient.timeout`) # https://html.spec.whatwg.org/multipage/interaction.html#transient-activation # 2 : user input depth (allow autoplay when the play is trigged by user input # which is determined by the user input depth) - name: media.autoplay.blocking_policy type: uint32_t value: 0 mirror: always # Whether to allow autoplay on extension background pages. - name: media.autoplay.allow-extension-background-pages type: bool value: true mirror: always # Block autoplay, asking for permission by default. # 0=Allowed, 1=Blocked, 5=All Blocked - name: media.autoplay.default type: int32_t value: 1 mirror: always # File-backed MediaCache size. - name: media.cache_size type: RelaxedAtomicUint32 value: 512000 # Measured in KiB mirror: always # Size of file backed MediaCache while on a connection which is cellular (3G, # etc), and thus assumed to be "expensive". - name: media.cache_size.cellular type: RelaxedAtomicUint32 value: 32768 # Measured in KiB mirror: always # Multiplier to change the sample rate at which input-only streams run, so as # to similate clock drift. - name: media.cubeb.input_drift_factor type: AtomicFloat mirror: always value: 1.f # Multiplier to change the sample rate at which output-only streams run, so as # to similate clock drift. - name: media.cubeb.output_drift_factor type: AtomicFloat mirror: always value: 1.f # Whether cubeb is sandboxed (AudioIPC) - name: media.cubeb.sandbox type: bool mirror: always #if defined(XP_LINUX) || defined(XP_WIN) || defined(XP_MACOSX) value: true #else value: false #endif # Whether or not to pass AUDCLNT_STREAMOPTIONS_RAW when initializing audio # streams when using WASAPI. # 0 - don't use RAW streams # 1 - use RAW streams for input streams only # 2 - use RAW streams for output streams only # 3 - use RAW streams for input and output streams #if defined (XP_WIN) - name: media.cubeb.wasapi-raw type: RelaxedAtomicUint32 mirror: always value: 0 #endif // XP_WIN # Whether to make the start of cubeb stream slower, and by how many # milliseconds. - name: media.cubeb.slow_stream_init_ms type: RelaxedAtomicUint32 mirror: always value: 0 # If a resource is known to be smaller than this size (in kilobytes), a # memory-backed MediaCache may be used; otherwise the (single shared global) # file-backed MediaCache is used. - name: media.memory_cache_max_size type: uint32_t value: 8192 # Measured in KiB mirror: always # Don't create more memory-backed MediaCaches if their combined size would go # above this absolute size limit. - name: media.memory_caches_combined_limit_kb type: uint32_t value: 524288 mirror: always # Don't create more memory-backed MediaCaches if their combined size would go # above this relative size limit (a percentage of physical memory). - name: media.memory_caches_combined_limit_pc_sysmem type: uint32_t value: 5 # A percentage mirror: always # When a network connection is suspended, don't resume it until the amount of # buffered data falls below this threshold (in seconds). - name: media.cache_resume_threshold type: RelaxedAtomicUint32 value: 30 mirror: always - name: media.cache_resume_threshold.cellular type: RelaxedAtomicUint32 value: 10 mirror: always # Stop reading ahead when our buffered data is this many seconds ahead of the # current playback position. This limit can stop us from using arbitrary # amounts of network bandwidth prefetching huge videos. - name: media.cache_readahead_limit type: RelaxedAtomicUint32 value: 60 mirror: always - name: media.cache_readahead_limit.cellular type: RelaxedAtomicUint32 value: 30 mirror: always # MediaCapabilities - name: media.mediacapabilities.drop-threshold type: RelaxedAtomicInt32 value: 95 mirror: always - name: media.mediacapabilities.from-database type: RelaxedAtomicBool value: @IS_NIGHTLY_BUILD@ mirror: always # AudioSink - name: media.resampling.enabled type: RelaxedAtomicBool value: false mirror: always # libcubeb backend implements .get_preferred_channel_layout - name: media.forcestereo.enabled type: RelaxedAtomicBool #if defined(XP_WIN) || defined(XP_DARWIN) || defined(MOZ_PULSEAUDIO) value: false #else value: true #endif mirror: always # MediaSource # Whether to enable MediaSource support. - name: media.mediasource.enabled type: RelaxedAtomicBool value: true mirror: always - name: media.mediasource.mp4.enabled type: RelaxedAtomicBool value: true mirror: always - name: media.mediasource.webm.enabled type: RelaxedAtomicBool value: true mirror: always # Check if vp9 is enabled by default in mediasource. False on Android. # If disabled, vp9 will only be enabled under some conditions: # - h264 HW decoding is not supported # - mp4 is not enabled # - Device was deemed fast enough to decode VP9 via the VP9Benchmark utility # - A VP9 HW decoder is present. - name: media.mediasource.vp9.enabled type: RelaxedAtomicBool value: @IS_NOT_ANDROID@ mirror: always # Whether to enable MediaSource v2 support. - name: media.mediasource.experimental.enabled type: RelaxedAtomicBool value: false mirror: always # Whether to enable experimental requestVideoFrameCallback support - name: media.rvfc.enabled type: bool value: true mirror: always # true for talos tests so that VideoSink passes on the most recently decoded # frame to exercise the compositor even when the frame is out of date because # the decoder is stressed. # If this were true for normal playback, then presentation of such late decoded # video frames would be out of sync with audio, and VideoPlaybackQuality # metrics would provide no indication of the poor playback. [1] # For normal playback, this is false, which does not restore A/V sync in this # situation, but some out-of-date frames are dropped. The dropped frame count # is reported to content in VideoPlaybackQuality metrics. # [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1258870#c6 - name: media.ruin-av-sync.enabled type: RelaxedAtomicBool value: false mirror: always # Encrypted Media Extensions - name: media.eme.enabled type: bool #if defined(XP_LINUX) && !defined(MOZ_WIDGET_ANDROID) # On Linux EME is visible but disabled by default. This is so that the "Play # DRM content" checkbox in the Firefox UI is unchecked by default. DRM # requires downloading and installing proprietary binaries, which users on an # open source operating systems didn't opt into. The first time a site using # EME is encountered, the user will be prompted to enable DRM, whereupon the # EME plugin binaries will be downloaded if permission is granted. value: false #else value: true #endif mirror: always # Whether we expose the functionality proposed in # https://w3c.github.io/encrypted-media/#ref-for-dom-mediakeysystemmediacapability-encryptionscheme-2 # I.e. if true, apps calling navigator.requestMediaKeySystemAccess() can pass # an optional encryption scheme as part of MediaKeySystemMediaCapability # objects. If a scheme is present when we check for support, we must ensure we # support that scheme in order to provide key system access. - name: media.eme.encrypted-media-encryption-scheme.enabled type: bool value: true mirror: always # Do we need explicit approval from the application to allow access to EME? # If true, Gecko will ask for permission before allowing MediaKeySystemAccess. # At time of writing this is aimed at GeckoView, and setting this to true # outside of GeckoView or test environments will likely break EME. - name: media.eme.require-app-approval type: bool value: false mirror: always - name: media.eme.audio.blank type: RelaxedAtomicBool value: false mirror: always - name: media.eme.video.blank type: RelaxedAtomicBool value: false mirror: always - name: media.eme.chromium-api.video-shmems type: RelaxedAtomicUint32 value: 6 mirror: always # Is support for MediaKeys.getStatusForPolicy enabled? - name: media.eme.hdcp-policy-check.enabled type: bool value: true mirror: always - name: media.eme.max-throughput-ms type: RelaxedAtomicUint32 value: 500 mirror: always - name: media.clearkey.persistent-license.enabled type: bool value: false mirror: always # Are test specific clearkey key systems enabled and exposed? - name: media.clearkey.test-key-systems.enabled type: RelaxedAtomicBool value: false mirror: always - name: media.cloneElementVisually.testing type: bool value: false mirror: always # Does the GMPlugin process initialize minimal XPCOM - name: media.gmp.use-minimal-xpcom type: RelaxedAtomicBool value: true mirror: always # Does the GMPlugin process use native event processing - name: media.gmp.use-native-event-processing type: RelaxedAtomicBool value: @IS_NOT_XP_MACOSX@ mirror: always #if defined(XP_LINUX) && defined(MOZ_SANDBOX) # Whether to allow, on a Linux system that doesn't support the necessary # sandboxing features, loading Gecko Media Plugins unsandboxed. However, EME # CDMs will not be loaded without sandboxing even if this pref is changed. - name: media.gmp.insecure.allow type: RelaxedAtomicBool value: false mirror: always #endif # (When reading the next line, know that preprocessor.py doesn't # understand parentheses, but && is higher precedence than ||.) #if defined(XP_WIN) && defined(_ARM64_) || defined(XP_MACOSX) # These prefs control whether or not we will allow x86/x64 plugins # to run on Windows ARM or Apple Silicon machines. This requires # launching the GMP child process executable in x86/x64 mode. We # expect to allow this for Widevine until an arm64 version of # Widevine and Clearkey is made available. We don't expect to need # to allow this for OpenH264. # # For Apple Silicon and OSX, it will be for universal builds and # whether or not it can use the x64 Widevine plugin. # # For Windows ARM, it will be for ARM builds and whether or not it # can use x86 Widevine or Clearkey plugins. # May a Widevine GMP x64 process be executed on ARM builds. - name: media.gmp-widevinecdm.allow-x64-plugin-on-arm64 type: RelaxedAtomicBool value: true mirror: always # May an OpenH264 GMP x64 process be executed on ARM builds. - name: media.gmp-gmpopenh264.allow-x64-plugin-on-arm64 type: RelaxedAtomicBool value: false mirror: always # May a Clearkey GMP x64 process be executed on ARM builds. - name: media.gmp-gmpclearkey.allow-x64-plugin-on-arm64 type: RelaxedAtomicBool value: false mirror: always #endif # Specifies whether the PDMFactory can create a test decoder that just outputs # blank frames/audio instead of actually decoding. The blank decoder works on # all platforms. - name: media.use-blank-decoder type: RelaxedAtomicBool value: false mirror: always - name: media.gpu-process-decoder type: RelaxedAtomicBool #if defined(XP_WIN) value: true #else value: false #endif mirror: always - name: media.ffvpx-hw.enabled type: RelaxedAtomicBool value: false mirror: always # The codecs in the vendored ffmpeg copy are usually prefered to the other # codecs. This allows changing this policy for testing purposes. - name: media.prefer-non-ffvpx type: RelaxedAtomicBool value: false mirror: always - name: media.rdd-process.enabled type: RelaxedAtomicBool #if defined(XP_WIN) value: true #elif defined(XP_MACOSX) value: true #elif defined(XP_LINUX) && !defined(ANDROID) value: true #elif defined(XP_FREEBSD) value: true #elif defined(XP_OPENBSD) value: true #elif defined(XP_SOLARIS) value: true #else value: false #endif mirror: always - name: media.rdd-retryonfailure.enabled type: RelaxedAtomicBool value: true mirror: always - name: media.rdd-process.startup_timeout_ms type: RelaxedAtomicInt32 value: 5000 mirror: always # Specifies how many times we restart RDD process after crash till we give up. # After first RDD restart we disable HW acceleration on Linux. - name: media.rdd-process.max-crashes type: RelaxedAtomicInt32 value: 2 mirror: always #ifdef MOZ_FFMPEG - name: media.rdd-ffmpeg.enabled type: RelaxedAtomicBool value: true mirror: always #endif - name: media.rdd-ffvpx.enabled type: RelaxedAtomicBool #if defined(XP_WIN) value: true #elif defined(XP_MACOSX) value: true #elif defined(XP_LINUX) && !defined(ANDROID) value: true #elif defined(XP_FREEBSD) value: true #elif defined(XP_OPENBSD) value: true #elif defined(XP_SOLARIS) value: true #else value: false #endif mirror: always #ifdef MOZ_WMF - name: media.rdd-wmf.enabled type: RelaxedAtomicBool value: true mirror: always #endif #ifdef MOZ_APPLEMEDIA - name: media.rdd-applemedia.enabled type: RelaxedAtomicBool value: true mirror: always #endif - name: media.rdd-vorbis.enabled type: RelaxedAtomicBool #if defined(XP_WIN) value: true #elif defined(XP_MACOSX) value: true #elif defined(XP_LINUX) && !defined(ANDROID) value: true #elif defined(XP_FREEBSD) value: true #elif defined(XP_OPENBSD) value: true #elif defined(XP_SOLARIS) value: true #else value: false #endif mirror: always - name: media.rdd-vpx.enabled type: RelaxedAtomicBool #if defined(XP_WIN) value: true #elif defined(XP_MACOSX) value: true #elif defined(XP_LINUX) && !defined(ANDROID) value: true #elif defined(XP_FREEBSD) value: true #elif defined(XP_OPENBSD) value: true #elif defined(XP_SOLARIS) value: true #else value: false #endif mirror: always - name: media.rdd-wav.enabled type: RelaxedAtomicBool #if defined(XP_WIN) value: true #elif defined(XP_MACOSX) value: true #elif defined(XP_LINUX) && !defined(ANDROID) value: true #elif defined(XP_FREEBSD) value: true #elif defined(XP_OPENBSD) value: true #elif defined(XP_SOLARIS) value: true #else value: false #endif mirror: always - name: media.rdd-opus.enabled type: RelaxedAtomicBool #if defined(XP_WIN) value: true #elif defined(XP_MACOSX) value: true #elif defined(XP_LINUX) && !defined(ANDROID) value: true #elif defined(XP_FREEBSD) value: true #elif defined(XP_OPENBSD) value: true #elif defined(XP_SOLARIS) value: true #else value: false #endif mirror: always - name: media.rdd-webaudio.batch.size type: RelaxedAtomicInt32 value: 100 mirror: always # This pref is here to control whether we want to perform audio decoding by # using the IPC actor within the Utility process rather than the RDD process. # When it is set to true, then the utility process will take precedence over RDD # to perform audio decoding. # TODO: Enabling for Isolated Processes builds on Android - name: media.utility-process.enabled type: RelaxedAtomicBool #if defined(XP_WIN) value: true #elif defined(XP_MACOSX) value: true #elif defined(XP_LINUX) && !defined(ANDROID) value: true #elif defined(ANDROID) && !defined(MOZ_ANDROID_CONTENT_SERVICE_ISOLATED_PROCESS) value: true #elif defined(XP_FREEBSD) value: true #elif defined(XP_OPENBSD) value: true #elif defined(XP_SOLARIS) value: true #else value: false #endif mirror: always # Specifies how many times we restart Utility process after crash till we give # up. - name: media.utility-process.max-crashes type: RelaxedAtomicInt32 value: 2 mirror: always #ifdef MOZ_FFMPEG - name: media.utility-ffmpeg.enabled type: RelaxedAtomicBool value: true mirror: always #endif - name: media.utility-ffvpx.enabled type: RelaxedAtomicBool value: true mirror: always #ifdef MOZ_WMF - name: media.utility-wmf.enabled type: RelaxedAtomicBool value: true mirror: always #endif #ifdef MOZ_APPLEMEDIA - name: media.utility-applemedia.enabled type: RelaxedAtomicBool value: true mirror: always #endif - name: media.utility-vorbis.enabled type: RelaxedAtomicBool value: true mirror: always - name: media.utility-wav.enabled type: RelaxedAtomicBool value: true mirror: always - name: media.utility-opus.enabled type: RelaxedAtomicBool value: true mirror: always #ifdef ANDROID # Enable the MediaCodec PlatformDecoderModule by default. - name: media.android-media-codec.enabled type: RelaxedAtomicBool value: true mirror: always # Bug 1771196 # Dont yet enable AndroidDecoderModule on Utility - name: media.utility-android-media-codec.enabled type: RelaxedAtomicBool value: false mirror: always - name: media.android-media-codec.preferred type: RelaxedAtomicBool value: true mirror: always #endif # ANDROID # Now we will completely disable the ability to perform audio decoding outside # of Utility. - name: media.allow-audio-non-utility type: RelaxedAtomicBool value: false mirror: always #ifdef MOZ_OMX - name: media.omx.enabled type: bool value: false mirror: always #endif # Allow ffmpeg decoder to decode directly onto shmem buffer - name: media.ffmpeg.customized-buffer-allocation type: RelaxedAtomicBool value: true mirror: always # Disable falling back to software decoders in case of frame drop - name: media.ffmpeg.disable-software-fallback type: RelaxedAtomicBool value: false mirror: always #ifdef MOZ_FFMPEG - name: media.ffmpeg.enabled type: RelaxedAtomicBool #if defined(XP_MACOSX) value: false #else value: true #endif mirror: always - name: media.libavcodec.allow-obsolete type: bool value: false mirror: always #endif # MOZ_FFMPEG # Allow using ffmpeg encoder - name: media.ffmpeg.encoder.enabled type: RelaxedAtomicBool #if !defined(MOZ_WIDGET_ANDROID) value: true #else value: false #endif mirror: always # A high quantizer value allows the encoder to use higher compression, but # resulting in lower quality for parts of the video. Using a lower value # restricts excessive compression, improving video quality but potentially # increasing file size. The quantizer's value range is controlled by the min # and max values below. The lower the value is, the finer the quantizer will be # Set AVCodecContext's qmin value to ffmpeg encoder - name: media.ffmpeg.encoder.quantizer-min type: RelaxedAtomicInt32 value: 10 # An empirical value for better performance mirror: always # Set AVCodecContext's qmax value to ffmpeg encoder - name: media.ffmpeg.encoder.quantizer-max type: RelaxedAtomicInt32 value: 35 # An empirical value for better quality of the video output mirror: always # Allow using openh264 decoding with ffmpeg - name: media.ffmpeg.allow-openh264 type: RelaxedAtomicBool value: @IS_NOT_NIGHTLY_BUILD@ mirror: always #ifdef MOZ_WIDGET_GTK # Use VA-API for ffmpeg video playback on Linux - name: media.ffmpeg.vaapi.enabled type: bool value: false mirror: once # Force to copy dmabuf video frames # Used for debugging/troubleshooting only # 0 - force disable # 1 - force enable # 2 - default - name: media.ffmpeg.vaapi.force-surface-zero-copy type: uint32_t value: 2 mirror: once #endif # MOZ_WIDGET_GTK # Set to true in marionette tests to disable the sanity test # which would lead to unnecessary start of the RDD process. - name: media.sanity-test.disabled type: RelaxedAtomicBool value: false mirror: always #ifdef MOZ_WMF - name: media.wmf.enabled type: RelaxedAtomicBool value: true mirror: always # Whether DD should consider WMF-disabled a WMF failure, useful for testing. - name: media.decoder-doctor.wmf-disabled-is-failure type: RelaxedAtomicBool value: false mirror: always - name: media.wmf.dxva.d3d11.enabled type: RelaxedAtomicBool value: true mirror: always - name: media.wmf.dxva.max-videos type: RelaxedAtomicUint32 value: 8 mirror: always - name: media.wmf.use-nv12-format type: RelaxedAtomicBool value: true mirror: always - name: media.wmf.zero-copy-nv12-textures type: bool value: true mirror: once # Enable hardware decoded video no copy even when it is blocked. - name: media.wmf.zero-copy-nv12-textures-force-enabled type: bool value: false mirror: once - name: media.wmf.force.allow-p010-format type: RelaxedAtomicBool value: false mirror: always - name: media.wmf.use-sync-texture type: bool value: true mirror: once - name: media.wmf.low-latency.enabled type: RelaxedAtomicBool value: true mirror: always - name: media.wmf.skip-blacklist type: RelaxedAtomicBool value: false mirror: always - name: media.wmf.amd.highres.enabled type: RelaxedAtomicBool value: true mirror: always - name: media.wmf.allow-unsupported-resolutions type: RelaxedAtomicBool value: true mirror: always - name: media.wmf.vp9.enabled type: RelaxedAtomicBool value: true mirror: always - name: media.wmf.av1.enabled type: RelaxedAtomicBool value: true mirror: always # Using Windows Media Foundation Media Engine for encrypted playback # 0 : disable, 1 : enable for encrypted and clear, # 2 : enable for encrypted only, 3 : enable for clear only - name: media.wmf.media-engine.enabled type: RelaxedAtomicUint32 value: 2 mirror: always # Testing purpose, enable media engine on channel decoder as well. - name: media.wmf.media-engine.channel-decoder.enabled type: RelaxedAtomicBool value: false mirror: always # The amount of video raw data the engine stream will queue - name: media.wmf.media-engine.raw-data-threshold.video type: RelaxedAtomicInt32 value: 500000 mirror: always # The amount of audio raw data the engine stream will queue - name: media.wmf.media-engine.raw-data-threshold.audio type: RelaxedAtomicInt32 value: 2000000 mirror: always # Specifies how many times we restart MFCDM process after crash till we give up. - name: media.wmf.media-engine.max-crashes type: RelaxedAtomicInt32 value: 2 mirror: always # Bypass the gfx block list check for the media engine playback. - name: media.wmf.media-engine.bypass-gfx-blocklist type: RelaxedAtomicBool value: false mirror: always # [TEST-ONLY] Use Media Foundation Clearkey CDM for EME related testing. - name: media.eme.wmf.clearkey.enabled type: RelaxedAtomicBool value: false mirror: always # [TEST-ONLY] use Media Foundation clearkey CDM dll to mock as an external CDM, # external CDM like Widevine and PlayReady so that we won't be interfered by # unexpected behaviors caused by the external library. - name: media.eme.wmf.use-mock-cdm-for-external-cdms type: RelaxedAtomicBool value: false mirror: always # Enable PlayReady DRM for EME - name: media.eme.playready.enabled type: RelaxedAtomicBool value: true mirror: always # Use IsTypeSupportedEx for PlayReady - name: media.eme.playready.istypesupportedex type: RelaxedAtomicBool value: true mirror: always # Enable HEVC support via the windows media foundation # 0 : disable, 1 : enable for media engine and MFT, # 2 : enable for media engine only - name: media.wmf.hevc.enabled type: RelaxedAtomicUint32 value: 1 mirror: always # Enable Widevine experiment DRM for EME - name: media.eme.widevine.experiment.enabled type: RelaxedAtomicBool value: false mirror: always # Enable origin filter for MFCDM support # 0 : disabled, 1 : enabled allowed list, 2 : enabled blocked list - name: media.eme.mfcdm.origin-filter.enabled type: RelaxedAtomicUint32 #if defined(NIGHTLY_BUILD) value: 2 #else value: 1 #endif mirror: always #endif # MOZ_WMF - name: media.decoder-doctor.testing type: bool value: false mirror: always - name: media.hardware-video-decoding.enabled type: bool value: true mirror: once - name: media.hardware-video-decoding.force-enabled type: bool value: false mirror: once # Whether to check the decoder supports recycling. - name: media.decoder.recycle.enabled type: RelaxedAtomicBool value: @IS_ANDROID@ mirror: always # Should MFR try to skip to the next key frame? - name: media.decoder.skip-to-next-key-frame.enabled type: RelaxedAtomicBool value: true mirror: always # The delay time (ms) before releasing an audio wakelock. - name: media.wakelock.audio.delay-releasing.ms type: RelaxedAtomicUint32 value: 10000 mirror: always # When video continues later than the current media time for this period of # time, then it will trigger skip-to-next-keyframe mechanism. As this aims to # solve the drop frames issue where video decoding too slow for high # resolution videos. eg. 4k+. Therefore, the value is is determined by the # telemetry probe `video_inter_keyframe_max_ms` in the key of `AV,h>2160` which # shows that 95% video's key frame interval are less than ~5000. We use its # half value as a threashold to decide whether we should keep decoding in the # current video position or jump to the next keyframe in order to decode future # frames in advance. - name: media.decoder.skip_when_video_too_slow_ms type: RelaxedAtomicInt32 value: 2500 mirror: always # True if we want to decode in batches. - name: media.gmp.decoder.decode_batch type: RelaxedAtomicBool value: false mirror: always # True if we allow use of any decoders found in GMP plugins. - name: media.gmp.decoder.enabled type: RelaxedAtomicBool value: true mirror: always # True if we want to request the multithreaded GMP decoder. - name: media.gmp.decoder.multithreaded type: RelaxedAtomicBool value: false mirror: always # True if we want to try using the GMP plugin decoders first. - name: media.gmp.decoder.preferred type: RelaxedAtomicBool value: false mirror: always # True if we want to reorder frames from the decoder based on the timestamp. - name: media.gmp.decoder.reorder_frames type: RelaxedAtomicBool value: true mirror: always # True if we allow use of any encoders found in GMP plugins. - name: media.gmp.encoder.enabled type: RelaxedAtomicBool value: false mirror: always # True if we want to request the multithreaded GMP encoder. - name: media.gmp.encoder.multithreaded type: RelaxedAtomicBool value: false mirror: always # True if we want to try using the GMP plugin encoders first. - name: media.gmp.encoder.preferred type: RelaxedAtomicBool value: false mirror: always # Whether to suspend decoding of videos in background tabs. - name: media.suspend-background-video.enabled type: RelaxedAtomicBool value: true mirror: always # Delay, in ms, from time window goes to background to suspending # video decoders. Defaults to 10 seconds. - name: media.suspend-background-video.delay-ms type: RelaxedAtomicUint32 value: 10000 mirror: always - name: media.dormant-on-pause-timeout-ms type: RelaxedAtomicInt32 value: 5000 mirror: always # AudioTrack and VideoTrack support - name: media.track.enabled type: bool value: false mirror: always # This pref disables the reception of RTCP. It is used for testing. - name: media.webrtc.net.force_disable_rtcp_reception type: ReleaseAcquireAtomicBool value: false mirror: always # This pref disables using PQ crypto for WebRTC DTLS code. - name: media.webrtc.enable_pq_dtls type: RelaxedAtomicBool value: @IS_EARLY_BETA_OR_EARLIER@ mirror: always # This pref controls whether dispatch testing-only events. - name: media.webvtt.testing.events type: bool value: false mirror: always - name: media.webspeech.synth.force_global_queue type: bool value: false mirror: always - name: media.webspeech.test.enable type: bool value: false mirror: always - name: media.webspeech.test.fake_fsm_events type: bool value: false mirror: always - name: media.webspeech.test.fake_recognition_service type: bool value: false mirror: always #ifdef MOZ_WEBSPEECH - name: media.webspeech.recognition.enable type: bool value: false mirror: always #endif - name: media.webspeech.recognition.force_enable type: bool value: false mirror: always #ifdef MOZ_WEBSPEECH - name: media.webspeech.synth.enabled type: bool value: true mirror: always #endif # MOZ_WEBSPEECH - name: media.encoder.webm.enabled type: RelaxedAtomicBool value: true mirror: always - name: media.audio-max-decode-error type: uint32_t #if defined(RELEASE_OR_BETA) value: 3 #else # Zero tolerance in pre-release builds to detect any decoder regression. value: 0 #endif mirror: always - name: media.video-max-decode-error type: uint32_t #if defined(RELEASE_OR_BETA) value: 2 #else # Zero tolerance in pre-release builds to detect any decoder regression. value: 0 #endif mirror: always # Are video stats enabled? (Disabling can help prevent fingerprinting.) - name: media.video_stats.enabled type: bool value: true mirror: always # forces the number of dropped frames to 0 - name: media.video.dropped_frame_stats.enabled type: bool value: true mirror: always # Opus - name: media.opus.enabled type: RelaxedAtomicBool value: true mirror: always # Wave - name: media.wave.enabled type: RelaxedAtomicBool value: true mirror: always # Ogg - name: media.ogg.enabled type: RelaxedAtomicBool value: true mirror: always # WebM - name: media.webm.enabled type: RelaxedAtomicBool value: true mirror: always # AV1 - name: media.av1.enabled type: RelaxedAtomicBool value: true mirror: always - name: media.av1.use-dav1d type: RelaxedAtomicBool value: true mirror: always - name: media.av1.new-thread-count-strategy type: RelaxedAtomicBool value: false mirror: always - name: media.av1.force-thread-count type: RelaxedAtomicInt32 value: 0 mirror: always - name: media.flac.enabled type: RelaxedAtomicBool value: true mirror: always # Hls - name: media.hls.enabled type: RelaxedAtomicBool #if defined(ANDROID) value: @IS_NOT_EARLY_BETA_OR_EARLIER@ #else value: false #endif mirror: always # Max number of HLS players that can be created concurrently. Used only on # Android and when "media.hls.enabled" is true. #ifdef ANDROID - name: media.hls.max-allocations type: uint32_t value: 20 mirror: always #endif - name: media.mp4.enabled type: RelaxedAtomicBool value: true mirror: always - name: media.mp4.sniff_iso_brand type: RelaxedAtomicBool value: true mirror: always # Error/warning handling, Decoder Doctor. # # Set to true to force demux/decode warnings to be treated as errors. - name: media.playback.warnings-as-errors type: RelaxedAtomicBool value: false mirror: always # Resume video decoding when the cursor is hovering on a background tab to # reduce the resume latency and improve the user experience. - name: media.resume-background-video-on-tabhover type: bool value: true mirror: always # Media Seamless Looping - name: media.seamless-looping type: RelaxedAtomicBool value: true mirror: always - name: media.seamless-looping-video type: RelaxedAtomicBool value: true mirror: always - name: media.autoplay.block-event.enabled type: bool value: false mirror: always - name: media.media-capabilities.screen.enabled type: RelaxedAtomicBool value: false mirror: always - name: media.benchmark.vp9.fps type: RelaxedAtomicUint32 value: 0 mirror: always - name: media.benchmark.vp9.threshold type: RelaxedAtomicUint32 value: 150 mirror: always - name: media.benchmark.vp9.versioncheck type: RelaxedAtomicUint32 value: 0 mirror: always - name: media.benchmark.frames type: RelaxedAtomicUint32 value: 300 mirror: always - name: media.benchmark.timeout type: RelaxedAtomicUint32 value: 1000 mirror: always - name: media.test.video-suspend type: RelaxedAtomicBool value: false mirror: always - name: media.test.null.decoder.creation-failure type: RelaxedAtomicBool value: false mirror: always # MediaCapture prefs follow # Enables navigator.mediaDevices and getUserMedia() support. See also # media.peerconnection.enabled - name: media.navigator.enabled type: bool value: true mirror: always # This pref turns off window-focus checks on the navigator.mediaDevices methods, # for partner testing frameworks. # Prefer "focusmanager.testmode", which is already set by default for # web-platform tests. - name: media.devices.unfocused.enabled type: bool value: false mirror: always # This pref turns off [SecureContext] on the navigator.mediaDevices object, for # more compatible legacy behavior. - name: media.devices.insecure.enabled type: bool value: false mirror: always # If the above pref is also enabled, this pref enabled getUserMedia() support # in http, bypassing the instant NotAllowedError you get otherwise. - name: media.getusermedia.insecure.enabled type: bool value: false mirror: always # Enable tab sharing - name: media.getusermedia.browser.enabled type: RelaxedAtomicBool value: false mirror: always # The getDisplayMedia method is always SecureContext regardless of the above two # prefs. But it is not implemented on android, and can be turned off elsewhere. - name: media.getdisplaymedia.enabled type: bool value: @IS_NOT_ANDROID@ mirror: always # The getDisplayMedia prompt uses getDisplayMedia under the hood to show previews. # This can be turned off if, e.g. on systems with known issues like X11, or if # previews are not desired. - name: media.getdisplaymedia.previews.enabled type: bool value: @IS_NOT_ANDROID@ mirror: always #if defined(MOZ_WEBRTC) && defined(XP_MACOSX) # Use the libwebrtc ScreenCaptureKit desktop capture backend on Mac by default. # When disabled, or on a host where not supported (< macOS 14), the older # CoreGraphics backend is used instead. - name: media.getdisplaymedia.screencapturekit.enabled type: bool value: true mirror: once # Use SCContentSharingPicker for source picking when the libwebrtc # ScreenCaptureKit desktop capture backend is used. When this is true and the # backend supports SCContentSharingPicker, this takes precendence over the # enumeration pref below. - name: media.getdisplaymedia.screencapturekit.picker.enabled type: bool value: true mirror: once # Use the libwebrtc ScreenCaptureKit desktop capture backend on Mac for screen # enumeration when enabled. # When this is false and the backend is used (see above), the older CoreGraphics # backend is used to enumerate CGDirectDisplayIDs, which the ScreenCaptureKit # backend understand as well. - name: media.getdisplaymedia.screencapturekit.enumeration.enabled type: bool value: false mirror: once #endif # Turn off any cameras (but not mics) while in the background. This is desirable # on mobile. - name: media.getusermedia.camera.background.mute.enabled type: bool value: @IS_ANDROID@ mirror: always # Use the libwebrtc AVFoundation camera backend on Mac by default. When # disabled, an older forked capture module is used. - name: media.getusermedia.camera.macavf.enabled type: bool value: true mirror: once # Tell the audio backend to prefer a stream adapted for voice when processing is # enabled through constraints (possibly defaults). Whether it has any effect # depends on the backend. - name: media.getusermedia.microphone.prefer_voice_stream_with_processing.enabled type: RelaxedAtomicBool value: true mirror: always # Tell the audio backend to create a voice stream for later re-use before asking # the user for microphone permissions, if approving those permissions would # result in a voice stream when created later on. - name: media.getusermedia.microphone.voice_stream_priming.enabled type: RelaxedAtomicBool value: @IS_XP_MACOSX@ mirror: always # This pref turns on legacy (non-spec) exposure of camera and microphone # information from enumerateDevices and devicechange ahead of successful # getUserMedia calls. Should only be turned on to resolve web compat issues, # since doing so reveals more user fingerprinting information to trackers. # # In this mode, camera and microphone device labels are exposed if the site has a # persisted permission to either kind, as well as while actively capturing either # kind (temporary and tab-specific grace-period permissions do not count). - name: media.devices.enumerate.legacy.enabled type: bool value: false mirror: always # Turns on legacy (non-spec) exposure of camera and microphone information # from enumerateDevices and devicechange ahead of successful getUserMedia # calls only for certain domains (ignored if above pref is true). - name: media.devices.enumerate.legacy.allowlist type: String value: "slack.com,*.slack.com" mirror: never # WebRTC prefs follow # Enables auto refresh of peerconnection stats by default - name: media.aboutwebrtc.auto_refresh.peerconnection_section type: bool value: @IS_NOT_NIGHTLY_BUILD@ mirror: always # Enables auto refresh of the transport connection log by default - name: media.aboutwebrtc.auto_refresh.connection_log_section type: bool value: false mirror: always # Enables auto refresh of user config by default - name: media.aboutwebrtc.auto_refresh.user_modified_config_section type: bool value: true mirror: always # Enables auto refresh of media context by default - name: media.aboutwebrtc.auto_refresh.media_ctx_section type: bool value: false mirror: always # Enables RTCPeerConnection support. Note that, when true, this pref enables # navigator.mediaDevices and getUserMedia() support as well. # See also media.navigator.enabled - name: media.peerconnection.enabled type: RelaxedAtomicBool value: true mirror: always - name: media.peerconnection.scripttransform.enabled type: RelaxedAtomicBool value: true mirror: always #ifdef MOZ_WEBRTC # Use MediaDataDecoder API for VP8/VP9 in WebRTC. This includes hardware # acceleration for decoding. - name: media.navigator.mediadatadecoder_vpx_enabled type: RelaxedAtomicBool #if defined(NIGHTLY_BUILD) || defined(MOZ_WIDGET_GTK) value: true #else value: false #endif mirror: always # Use MediaDataDecoder API for H264 in WebRTC. This includes hardware # acceleration for decoding. - name: media.navigator.mediadatadecoder_h264_enabled type: RelaxedAtomicBool #if defined(_ARM64_) && defined(XP_WIN) value: false #else value: true #endif mirror: always #if defined(MOZ_WIDGET_GTK) # Use hardware acceleration for VP8 decoding on Linux. - name: media.navigator.mediadatadecoder_vp8_hardware_enabled type: RelaxedAtomicBool value: false mirror: always #endif # Interval in milliseconds at which to gather WebRTC stats for use in about:webrtc. - name: media.aboutwebrtc.hist.poll_interval_ms type: RelaxedAtomicUint32 value: 250 mirror: always # History time depth in seconds to keep for webrtc:stats for use in about:webrtc. - name: media.aboutwebrtc.hist.storage_window_s type: RelaxedAtomicUint32 value: 60 mirror: always # Time in minutes to retain peer connection stats after closing. - name: media.aboutwebrtc.hist.prune_after_m type: RelaxedAtomicUint32 value: 60 * 24 * 2 mirror: always # Max number of closed PC stats histories to retain - name: media.aboutwebrtc.hist.closed_stats_to_retain type: RelaxedAtomicUint32 value: 8 mirror: always # Gather PeerConnection stats history for display in about:webrtc. If # disabled history will only gather when about:webrtc is open. Additionally, # if disabled and when about:webrtc is not in the foreground history data # will become sparse. - name: media.aboutwebrtc.hist.enabled type: RelaxedAtomicBool #if defined(MOZ_WIDGET_ANDROID) value: false #else value: @IS_NIGHTLY_BUILD@ #endif mirror: always #endif # MOZ_WEBRTC # HTMLMediaElement.allowedToPlay should be exposed to web content when # block autoplay rides the trains to release. Until then, Nightly only. - name: media.allowed-to-play.enabled type: bool value: @IS_NIGHTLY_BUILD@ mirror: always # Is support for MediaDevices.ondevicechange enabled? - name: media.ondevicechange.enabled type: bool value: true mirror: always # Is support for HTMLMediaElement.seekToNextFrame enabled? - name: media.seekToNextFrame.enabled type: bool value: false mirror: always # Is the Audio Output Devices API enabled? - name: media.setsinkid.enabled type: bool #if defined(MOZ_WIDGET_ANDROID) value: false # bug 1473346 #else value: true #endif mirror: always # Turn on this pref can enable test-only events for media element. - name: media.testing-only-events type: bool value: false mirror: always - name: media.useAudioChannelService.testing type: bool value: false mirror: always - name: media.audioFocus.management type: bool #if defined(MOZ_WIDGET_ANDROID) value: true #else value: false #endif mirror: always - name: media.hardwaremediakeys.enabled type: bool value: true mirror: always # If this pref is on, then `media.mediacontrol.stopcontrol.timer.ms` would take # effect and determine the timing to stop controlling media. - name: media.mediacontrol.stopcontrol.timer type: bool value: true mirror: always # If media is being paused after a certain period, then we would think that # media doesn't need to be controlled anymore. Therefore, that media would stop # listening to the media control key events. The value of this pref is how long # media would stop listening to the event after it's paused. The default value # is set to 24 hrs (24*60*60*1000) - name: media.mediacontrol.stopcontrol.timer.ms type: RelaxedAtomicUint32 value: 86400000 mirror: always # If this pref is on, we would stop controlling media after it reaches to the # end. - name: media.mediacontrol.stopcontrol.aftermediaends type: bool value: true mirror: always # We would only use media control to control media which duration is longer # than this value. - name: media.mediacontrol.eligible.media.duration.s type: AtomicFloat value: 3.0f mirror: always # Encoder creation strategy for WebRTC # 0: prefer builtin WebRTC encoder (including OpenH264 via GMP) # 1: prefer PlatformEncoderModule - name: media.webrtc.encoder_creation_strategy type: RelaxedAtomicUint32 #ifdef ANDROID value: 1 #else value: 0 #endif mirror: always #if defined(XP_MACOSX) - name: media.webrtc.capture.allow-iosurface type: RelaxedAtomicBool value: true mirror: always #endif #if defined(XP_WIN) - name: media.webrtc.capture.allow-directx type: RelaxedAtomicBool value: true mirror: always - name: media.webrtc.capture.screen.allow-wgc type: RelaxedAtomicBool value: false mirror: always - name: media.webrtc.capture.window.allow-wgc type: RelaxedAtomicBool value: false mirror: always - name: media.webrtc.capture.wgc.allow-zero-hertz type: RelaxedAtomicBool value: false mirror: always #endif #if defined(MOZ_WIDGET_GTK) - name: media.webrtc.capture.allow-pipewire type: RelaxedAtomicBool value: true mirror: always - name: media.webrtc.camera.allow-pipewire type: bool value: false mirror: once #endif - name: media.block-autoplay-until-in-foreground type: bool #if !defined(MOZ_WIDGET_ANDROID) value: true #else value: false #endif mirror: always - name: media.webrtc.hw.h264.enabled type: bool #if defined(MOZ_WIDGET_ANDROID) value: true #else value: false #endif mirror: always - name: media.webrtc.codec.video.av1.enabled type: RelaxedAtomicBool #if defined(MOZ_AV1) value: @IS_NIGHTLY_BUILD@ #else value: false #endif mirror: always # If true, then AV1 will be used as the preferred codec for WebRTC video. # After the AV1 codec is enabled by default, this pref will be renamed. - name: media.webrtc.codec.video.av1.experimental_preferred type: bool value: false mirror: always - name: media.webrtc.simulcast.vp9.enabled type: RelaxedAtomicBool value: false mirror: always - name: media.webrtc.tls_tunnel_for_all_proxy type: bool value: true mirror: always - name: media.webrtc.disallow_HTTPS_upgrade_for_TURN type: bool value: true mirror: always # If true, then we require explicit approval from the embedding app (ex. Fenix) # on GeckoView to know if we can allow audible, inaudible media or both kinds # of media to autoplay. - name: media.geckoview.autoplay.request type: bool value: false mirror: always # This is used in testing only, in order to skip the prompting process. This # pref works only when enabling the pref `media.geckoview.autoplay.request`. # 0=prompt as normal, 1=allow all, 2=deny all, 3=allow audible request, # 4=deny audible request, 5=allow inaudible request, 6=deny inaudible request. # 7=leave all requests pending. - name: media.geckoview.autoplay.request.testing type: uint32_t value: 0 mirror: always - name: media.mediacontrol.testingevents.enabled type: bool value: false mirror: always #if defined(XP_MACOSX) - name: media.macos.screenrecording.oscheck.enabled type: bool value: true mirror: always #endif # When the playback rate of an HTMLMediaElement is greater than this value, or # lower than the inverse of this value, the audio is muted. - name: media.audio.playbackrate.muting_threshold type: uint32_t value: 8 mirror: always # The interval of time in milliseconds between attempts to reopen any # previously unavailable audio device. - name: media.audio.device.retry.ms type: RelaxedAtomicInt32 value: 1000 mirror: always # Time-stretch algorithm single processing sequence length in milliseconds. # This determines to how long sequences the original sound is chopped in the # time-stretch algorithm. - name: media.audio.playbackrate.soundtouch_sequence_ms type: RelaxedAtomicInt32 value: 10 mirror: always # Time-stretch algorithm seeking window length in milliseconds for algorithm # that finds the best possible overlapping location. This determines from how # wide window the algorithm may look for an optimal joining location when mixing # the sound sequences back together. - name: media.audio.playbackrate.soundtouch_seekwindow_ms type: RelaxedAtomicInt32 value: 15 mirror: always # Time-stretch algorithm overlap length in milliseconds. When the chopped sound # sequences are mixed back together, to form a continuous sound stream, this # parameter defines over how long period the two consecutive sequences are let # to overlap each other. - name: media.audio.playbackrate.soundtouch_overlap_ms type: RelaxedAtomicInt32 value: 8 mirror: always # The duration, in milliseconds, of decoded audio to keep around in the # AudioSink ring-buffer. New decoding operations are started when this limit is # reached. The total size of the ring-buffer is slightly bigger than this. - name: media.audio.audiosink.threshold_ms type: AtomicFloat #if defined(XP_MACOSX) && defined(MOZ_AARCH64) value: 1000.0 #else value: 200.0 #endif mirror: always - name: media.video-wakelock type: RelaxedAtomicBool value: true mirror: always # On Mac, enables using the ` Media Plugin Helper` executable as the # GMP child process instead of the plugin-container executable. #if defined(XP_MACOSX) - name: media.plugin_helper_process.enabled type: RelaxedAtomicBool value: true mirror: always #endif # When this is true, the protection mask that Firefox replies to Widevine API # QueryOutputProtectionStatus is `kProtectionHDCP` when no potential capturing. - name: media.widevine.hdcp-protection-mask type: RelaxedAtomicBool value: true mirror: always #--------------------------------------------------------------------------- # Prefs starting with "memory." #--------------------------------------------------------------------------- - name: memory.phc.enabled type: bool value: true mirror: always - name: memory.phc.min_ram_mb type: uint32_t value: 8000 mirror: always - name: memory.phc.avg_delay.first type: uint32_t value: 65536 mirror: always - name: memory.phc.avg_delay.normal type: uint32_t value: 16384 mirror: always - name: memory.phc.avg_delay.page_reuse type: uint32_t value: 262144 mirror: always - name: memory.phc.avg_delay.content.first type: uint32_t value: 16384 mirror: always - name: memory.phc.avg_delay.content.normal type: uint32_t value: 4096 mirror: always - name: memory.phc.avg_delay.content.page_reuse type: uint32_t value: 262144 mirror: always #--------------------------------------------------------------------------- # Prefs starting with "middlemouse." #--------------------------------------------------------------------------- # If set and browser.tabs.opentabfor.middleclick is not set, middle clicking on # a link opens the link in a new window. - name: middlemouse.openNewWindow type: bool #if defined(ANDROID) || !defined(XP_MACOSX) && defined(XP_UNIX) value: true #else value: false #endif mirror: always #--------------------------------------------------------------------------- # Prefs starting with "midi." #--------------------------------------------------------------------------- - name: midi.testing type: RelaxedAtomicBool value: false mirror: always #--------------------------------------------------------------------------- # Prefs starting with "mousewheel." #--------------------------------------------------------------------------- # This affects how line scrolls from wheel events will be accelerated. # Factor to be multiplied for constant acceleration. - name: mousewheel.acceleration.factor type: RelaxedAtomicInt32 value: 10 mirror: always # This affects how line scrolls from wheel events will be accelerated. # Number of mousewheel clicks when acceleration starts. # Acceleration can be turned off if pref is set to -1. - name: mousewheel.acceleration.start type: RelaxedAtomicInt32 value: -1 mirror: always # Auto-dir is a feature which treats any single-wheel scroll as a scroll in the # only one scrollable direction if the target has only one scrollable # direction. For example, if the user scrolls a vertical wheel inside a target # which is horizontally scrollable but vertical unscrollable, then the vertical # scroll is converted to a horizontal scroll for that target. # Note that auto-dir only takes effect for |mousewheel.*.action|s and # |mousewheel.*.action.override_x|s whose values are 1. - name: mousewheel.autodir.enabled type: bool value: false mirror: always # When a wheel scroll is converted due to auto-dir, which side the converted # scroll goes towards is decided by one thing called "honoured target". If the # content of the honoured target horizontally starts from right to left, then # an upward scroll maps to a rightward scroll and a downward scroll maps to a # leftward scroll; otherwise, an upward scroll maps to a leftward scroll and a # downward scroll maps to a rightward scroll. # If this pref is set to false, then consider the scrolling target as the # honoured target. # If set to true, then consider the root element in the document where the # scrolling target is as the honoured target. But note that there's one # exception: for targets in an HTML document, the real root element(I.e. the # element) is typically not considered as a root element, but the # element is typically considered as a root element. If there is no # element, then consider the element instead. - name: mousewheel.autodir.honourroot type: bool value: false mirror: always - name: mousewheel.system_scroll_override.enabled type: RelaxedAtomicBool #if defined(XP_WIN) || defined(MOZ_WIDGET_GTK) value: true #else value: false #endif mirror: always # Prefs for overriding the system mouse wheel scrolling speed on # content of the web pages. When # "mousewheel.system_scroll_override.enabled" is true and the # system scrolling speed isn't customized by the user, the content scrolling # speed is multiplied by the following factors. The value will be used as # 1/100. E.g., 200 means 2.00. # NOTE: Even if "mousewheel.system_scroll_override.enabled" is # true, when Gecko detects the user customized the system scrolling speed # settings, the override isn't executed. - name: mousewheel.system_scroll_override.horizontal.factor type: RelaxedAtomicInt32 value: 200 mirror: always - name: mousewheel.system_scroll_override.vertical.factor type: RelaxedAtomicInt32 value: 200 mirror: always # Mouse wheel scroll transaction is held even if the mouse cursor is moved. - name: mousewheel.transaction.ignoremovedelay type: RelaxedAtomicInt32 value: 100 mirror: always # Mouse wheel scroll transaction period of time (in milliseconds). - name: mousewheel.transaction.timeout type: RelaxedAtomicInt32 value: 1500 mirror: always # Mouse wheel scroll position is determined by GetMessagePos rather than # LPARAM msg value - name: mousewheel.ignore_cursor_position_in_lparam type: RelaxedAtomicBool value: false mirror: always # If line-height is lower than this value (in device pixels), 1 line scroll # scrolls this height. - name: mousewheel.min_line_scroll_amount type: int32_t value: 5 mirror: always # Timeout period (in milliseconds) when the mouse wheel event is no longer # handled as the same series. - name: mousewheel.scroll_series_timeout type: RelaxedAtomicInt32 value: 80 mirror: always #--------------------------------------------------------------------------- # Prefs starting with "mozilla." #--------------------------------------------------------------------------- - name: mozilla.widget.raise-on-setfocus type: bool value: true mirror: once #--------------------------------------------------------------------------- # Prefs starting with "network." #--------------------------------------------------------------------------- # Force less-secure NTLMv1 when needed (NTLMv2 is the default). - name: network.auth.force-generic-ntlm-v1 type: RelaxedAtomicBool value: false mirror: always # Sub-resources HTTP-authentication: # 0 - don't allow sub-resources to open HTTP authentication credentials # dialogs # 1 - allow sub-resources to open HTTP authentication credentials dialogs, # but don't allow it for cross-origin sub-resources # 2 - allow the cross-origin authentication as well. - name: network.auth.subresource-http-auth-allow type: uint32_t value: 2 mirror: always # Sub-resources HTTP-authentication for cross-origin images: # - true: It is allowed to present http auth. dialog for cross-origin images. # - false: It is not allowed. # If network.auth.subresource-http-auth-allow has values 0 or 1 this pref does # not have any effect. - name: network.auth.subresource-img-cross-origin-http-auth-allow type: bool value: false mirror: always # Resources that are triggered by some non-web-content: # - true: They are allow to present http auth. dialog # - false: They are not allow to present http auth. dialog. - name: network.auth.non-web-content-triggered-resources-http-auth-allow type: bool value: false mirror: always # Whether to show anti-spoof confirmation prompts when navigating to a url # with userinfo - name: network.auth.confirmAuth.enabled type: bool value: false mirror: always # Whether to display auth prompts if X-Frame-Options header will block loading # page - name: network.auth.supress_auth_prompt_for_XFO_failures type: bool value: true mirror: always # whether to redirect the channel for auth redirects. See Bug 1820807 - name: network.auth.use_redirect_for_retries type: RelaxedAtomicBool value: @IS_EARLY_BETA_OR_EARLIER@ mirror: always # When true, authentication challenges will be sorted even if # an authentication is already in progress. This may cause issues sometimes. - name: network.auth.sort_challenge_in_progress type: RelaxedAtomicBool value: false mirror: always # See the full list of values in nsICookieService.idl. - name: network.cookie.cookieBehavior type: RelaxedAtomicInt32 value: 0 # accept all cookies mirror: always # Maximum client-side cookie life-time cap. Measured in seconds, set to 0 to # disable. - name: network.cookie.maxageCap type: uint32_t value: 34560000 mirror: always # The cookieBehavior to be used in Private Browsing mode. - name: network.cookie.cookieBehavior.pbmode type: RelaxedAtomicInt32 value: 0 # accept all cookies mirror: always # Changes cookieBehavior=5 to block third-party cookies by default - name: network.cookie.cookieBehavior.optInPartitioning type: bool value: @IS_NIGHTLY_BUILD@ mirror: always # Changes cookieBehavior=5 to block third-party cookies in the private browsing # mode. - name: network.cookie.cookieBehavior.optInPartitioning.pbmode type: bool value: @IS_NIGHTLY_BUILD@ mirror: always # Whether to block third-party tracker cookie and storage access when # cookieBehavior=5. - name: network.cookie.cookieBehavior.trackerCookieBlocking type: bool value: @IS_NOT_NIGHTLY_BUILD@ mirror: always # Whether to support CHIPS(Cookies Having Independent Partitioned State). - name: network.cookie.CHIPS.enabled type: RelaxedAtomicBool value: @IS_NIGHTLY_BUILD@ mirror: always # Updated to match the target count when we migrate the unpartitioned CHIPS # cookies to their first-party partition. - name: network.cookie.CHIPS.lastMigrateDatabase type: RelaxedAtomicUint32 value: 0 mirror: always # Used to increase the number of times we want to have migrated the database. # This lets us remotely perform a database migration with Nimbus. - name: network.cookie.CHIPS.migrateDatabaseTarget type: RelaxedAtomicUint32 value: 1 mirror: always # Stale threshold for cookies in seconds. - name: network.cookie.staleThreshold type: uint32_t value: 60 mirror: always # Enable CHIPS partition byte limit enforcement # This pref will only be consulted if CHIPS itself is enabled - name: network.cookie.chips.partitionLimitEnabled type: bool value: true mirror: always # CHIPS partition limit DryRun mode disables purging/rejection # but still checks for capacity overflow and reports telemetry - name: network.cookie.chips.partitionLimitDryRun type: bool value: @IS_NOT_NIGHTLY_BUILD@ mirror: always # The actual CHIPS parition limit in bytes - name: network.cookie.chips.partitionLimitByteCapacity type: RelaxedAtomicInt32 value: 10240 # 10KiB mirror: always - name: network.cookie.sameSite.laxByDefault type: RelaxedAtomicBool value: false mirror: always - name: network.cookie.sameSite.laxByDefaultWarningsForBeta type: RelaxedAtomicBool value: false mirror: always # lax-by-default 2 minutes tollerance for unsafe methods. The value is in seconds. - name: network.cookie.sameSite.laxPlusPOST.timeout type: uint32_t value: 120 mirror: always # For lax-by-default cookies ignore cross-site redirects when the final # redirect is same-site again. # https://github.com/httpwg/http-extensions/issues/2104 - name: network.cookie.sameSite.laxByDefault.allowBoomerangRedirect type: bool value: true mirror: always - name: network.cookie.sameSite.noneRequiresSecure type: bool value: true mirror: always - name: network.cookie.sameSite.schemeful type: bool value: @IS_NIGHTLY_BUILD@ mirror: always - name: network.cookie.sameSite.crossSiteIframeSetCheck type: bool value: true mirror: always # If we should not store "persistent" cookies at all, i.e., make the # "persistent" storage be like "private" storage. This value is only read when # instantiating persistent storage for the cookie service, which usually only # happens when the cookie service singleton is created. - name: network.cookie.noPersistentStorage type: bool value: false mirror: always # If true then any cookies containing unicode will be rejected - name: network.cookie.blockUnicode type: RelaxedAtomicBool value: false mirror: always # If true cookies loaded from the sqlite DB that have a creation or # last accessed time that is in the future will be fixed and the # timestamps will be set to the current time. - name: network.cookie.fixup_on_db_load type: RelaxedAtomicBool value: true mirror: always # If true content types of multipart/x-mixed-replace cannot set a cookie - name: network.cookie.prevent_set_cookie_from_multipart type: RelaxedAtomicBool value: true mirror: always # Use sever time (Date header) to adjust the expire cookie attribute - name: network.cookie.useServerTime type: RelaxedAtomicBool value: true mirror: always # If we should attempt to race the cache and network. - name: network.http.rcwn.enabled type: bool value: true mirror: always - name: network.http.rcwn.cache_queue_normal_threshold type: uint32_t value: 8 mirror: always - name: network.http.rcwn.cache_queue_priority_threshold type: uint32_t value: 2 mirror: always # We might attempt to race the cache with the network only if a resource # is smaller than this size. - name: network.http.rcwn.small_resource_size_kb type: uint32_t value: 256 mirror: always - name: network.http.rcwn.min_wait_before_racing_ms type: uint32_t value: 0 mirror: always - name: network.http.rcwn.max_wait_before_racing_ms type: uint32_t value: 500 mirror: always # Whether to send the Referer header in response to a meta refresh, or # in response to a Refresh header. - name: network.http.referer.sendFromRefresh type: bool value: @IS_NIGHTLY_BUILD@ mirror: always # false=real referer, true=spoof referer (use target URI as referer). - name: network.http.referer.spoofSource type: bool value: false mirror: always # Check whether we need to hide referrer when leaving a .onion domain. # false=allow onion referer, true=hide onion referer (use empty referer). - name: network.http.referer.hideOnionSource type: bool value: true mirror: always # Include an origin header on non-GET and non-HEAD requests regardless of CORS. # 0=never send, 1=send when same-origin only, 2=always send. - name: network.http.sendOriginHeader type: uint32_t value: 2 mirror: always # Include an idempotency-key header for POST requests - name: network.http.idempotencyKey.enabled type: RelaxedAtomicBool value: @IS_NIGHTLY_BUILD@ mirror: always # Whether to respect the redirected-tainted origin flag # https://fetch.spec.whatwg.org/#concept-request-tainted-origin - name: network.http.origin.redirectTainted type: bool value: true mirror: always # If true, cross origin fetch (or XHR) requests would be keyed # with a different cache key. - name: network.fetch.cache_partition_cross_origin type: RelaxedAtomicBool value: true mirror: always # If true, when browser code itself makes network requests, default to # omitting credentials. - name: network.fetch.systemDefaultsToOmittingCredentials type: RelaxedAtomicBool value: true mirror: always # Prefs allowing granular control of referers. # 0=don't send any, 1=send only on clicks, 2=send on image requests as well - name: network.http.sendRefererHeader type: uint32_t value: 2 mirror: always do_not_use_directly: true # Whether to add urgency and incremental to request headers - name: network.http.priority_header.enabled type: RelaxedAtomicBool value: true mirror: always # The maximum allowed length for a referrer header - 4096 default. # 0 means no limit. - name: network.http.referer.referrerLengthLimit type: uint32_t value: 4096 mirror: always # 0=always send, 1=send iff base domains match, 2=send iff hosts match. - name: network.http.referer.XOriginPolicy type: uint32_t value: 0 mirror: always do_not_use_directly: true # 0=full URI, 1=scheme+host+port+path, 2=scheme+host+port. - name: network.http.referer.trimmingPolicy type: uint32_t value: 0 mirror: always do_not_use_directly: true # 0=full URI, 1=scheme+host+port+path, 2=scheme+host+port. - name: network.http.referer.XOriginTrimmingPolicy type: uint32_t value: 0 mirror: always do_not_use_directly: true # Set the default Referrer Policy; to be used unless overriden by the site. # 0=no-referrer, 1=same-origin, 2=strict-origin-when-cross-origin, # 3=no-referrer-when-downgrade. - name: network.http.referer.defaultPolicy type: uint32_t value: 2 mirror: always # Set the default Referrer Policy applied to third-party trackers when the # default cookie policy is set to reject third-party trackers, to be used # unless overriden by the site. # 0=no-referrer, 1=same-origin, 2=strict-origin-when-cross-origin, # 3=no-referrer-when-downgrade. # Trim referrers from trackers to origins by default. - name: network.http.referer.defaultPolicy.trackers type: uint32_t value: 2 mirror: always # Set the Private Browsing Default Referrer Policy, to be used # unless overriden by the site. # 0=no-referrer, 1=same-origin, 2=strict-origin-when-cross-origin, # 3=no-referrer-when-downgrade. - name: network.http.referer.defaultPolicy.pbmode type: uint32_t value: 2 mirror: always # Set to ignore referrer policies which is less restricted than the default for # cross-site requests, including 'unsafe-url', 'no-referrer-when-downgrade' and # 'origin-when-cross-origin'. - name: network.http.referer.disallowCrossSiteRelaxingDefault type: bool value: true mirror: always # Whether we ignore less restricted referrer policies for top navigations. - name: network.http.referer.disallowCrossSiteRelaxingDefault.top_navigation type: bool value: false mirror: always # Set to ignore referrer policies which is less restricted than the default for # cross-site requests in the private browsing mode, including 'unsafe-url', # 'no-referrer-when-downgrade' and 'origin-when-cross-origin'. - name: network.http.referer.disallowCrossSiteRelaxingDefault.pbmode type: bool value: true mirror: always # Whether we ignore less restricted referrer policies for top navigations in the # private browsing mode. - name: network.http.referer.disallowCrossSiteRelaxingDefault.pbmode.top_navigation type: bool value: true mirror: always # Set the Private Browsing Default Referrer Policy applied to third-party # trackers when the default cookie policy is set to reject third-party # trackers, to be used unless overriden by the site. # 0=no-referrer, 1=same-origin, 2=strict-origin-when-cross-origin, # 3=no-referrer-when-downgrade. # No need to change this pref for trimming referrers from trackers since in # private windows we already trim all referrers to origin only. - name: network.http.referer.defaultPolicy.trackers.pbmode type: uint32_t value: 2 mirror: always # Whether certain http header values should be censored out in logs. # Specifically filters out "authorization" and "proxy-authorization". - name: network.http.sanitize-headers-in-logs type: RelaxedAtomicBool value: true mirror: always # Whether network error logging is enabled. - name: network.http.network_error_logging.enabled type: RelaxedAtomicBool value: false mirror: always # Whether or not we use Windows for SSO to Microsoft sites. - name: network.http.windows-sso.enabled type: RelaxedAtomicBool value: false mirror: always # Whether windows-sso is enabled for the default (0) container. # To enable SSO for additional containers, add a new pref like # `network.http.windows-sso.container-enabled.${containerId}` = true - name: network.http.windows-sso.container-enabled.0 type: bool value: true mirror: never # Whether or not we use MS Entra SSO to network.microsoft-sso-authority-list sites. - name: network.http.microsoft-entra-sso.enabled type: RelaxedAtomicBool value: false mirror: always # Whether microsoft-entra-sso is enabled for the default (0) container. # To enable SSO for additional containers, add a new pref like # `network.http.microsoft-entra-sso.container-enabled.${containerId}` = true - name: network.http.microsoft-entra-sso.container-enabled.0 type: bool value: true mirror: never # To specify the list of trusted Microsoft Single Sign-On (SSO) authority URLs # This is needed for macOS unlike Windows where we send every URL to SSO - name: network.microsoft-sso-authority-list type: String value: >- login.microsoft.com, login.microsoftonline.com, sts.windows.net, login.partner.microsoftonline.cn, login.chinacloudapi.cn, login.microsoftonline.us, login-us.microsoftonline.com mirror: never # The factor by which to increase the keepalive timeout when the # NS_HTTP_LARGE_KEEPALIVE flag is used for a connection - name: network.http.largeKeepaliveFactor type: RelaxedAtomicUint32 #if defined(ANDROID) value: 10 #else value: 20 #endif mirror: always # Max size, in bytes, for received HTTP response header. - name: network.http.max_response_header_size type: RelaxedAtomicUint32 value: 393216 mirror: always # Treat all Unicode labels as confusable/unsafe so that they show up # as Punycode in the UI. - name: network.IDN_show_punycode type: RelaxedAtomicBool value: false mirror: always # If set to true, IOService.offline depends on IOService.connectivity. - name: network.offline-mirrors-connectivity type: RelaxedAtomicBool value: false mirror: always # If set to true, disallow localhost connections when offline. - name: network.disable-localhost-when-offline type: RelaxedAtomicBool value: false mirror: always # Enables the predictive service. - name: network.predictor.enabled type: bool value: true mirror: always # Disable requests to 0.0.0.0 # See Bug 1889130 - name: network.socket.ip_addr_any.disabled type: RelaxedAtomicBool value: @IS_EARLY_BETA_OR_EARLIER@ mirror: always # Set true to allow resolving proxy for localhost - name: network.proxy.allow_hijacking_localhost type: RelaxedAtomicBool value: false mirror: always # This pref will still treat localhost URLs as secure even when hijacked # during testing. This is necessary for automated testing to check that we # actually treat localhost as a secure origin. - name: network.proxy.testing_localhost_is_secure_when_hijacked type: RelaxedAtomicBool value: false mirror: always # Allow CookieJarSettings to be unblocked for channels without a document. # This is for testing only. - name: network.cookieJarSettings.unblocked_for_testing type: bool value: false mirror: always - name: network.predictor.enable-hover-on-ssl type: bool value: false mirror: always - name: network.predictor.enable-prefetch type: bool value: @IS_EARLY_BETA_OR_EARLIER@ mirror: always - name: network.predictor.page-degradation.day type: int32_t value: 0 mirror: always - name: network.predictor.page-degradation.week type: int32_t value: 5 mirror: always - name: network.predictor.page-degradation.month type: int32_t value: 10 mirror: always - name: network.predictor.page-degradation.year type: int32_t value: 25 mirror: always - name: network.predictor.page-degradation.max type: int32_t value: 50 mirror: always - name: network.predictor.subresource-degradation.day type: int32_t value: 1 mirror: always - name: network.predictor.subresource-degradation.week type: int32_t value: 10 mirror: always - name: network.predictor.subresource-degradation.month type: int32_t value: 25 mirror: always - name: network.predictor.subresource-degradation.year type: int32_t value: 50 mirror: always - name: network.predictor.subresource-degradation.max type: int32_t value: 100 mirror: always - name: network.predictor.prefetch-rolling-load-count type: int32_t value: 10 mirror: always - name: network.predictor.prefetch-min-confidence type: int32_t value: 100 mirror: always - name: network.predictor.preconnect-min-confidence type: int32_t value: 90 mirror: always - name: network.predictor.preresolve-min-confidence type: int32_t value: 60 mirror: always - name: network.predictor.prefetch-force-valid-for type: int32_t value: 10 mirror: always - name: network.predictor.max-resources-per-entry type: int32_t value: 100 mirror: always # This is selected in concert with max-resources-per-entry to keep memory # usage low-ish. The default of the combo of the two is ~50k. - name: network.predictor.max-uri-length type: uint32_t value: 500 mirror: always # A testing flag. - name: network.predictor.doing-tests type: bool value: false mirror: always # Indicates whether the `fetchpriority` attribute for elements which support it # (e.g. `