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26e6b5110c5bca9f9b1602762970b41d0bb0babe
tubestation/modules/libpref/init/StaticPrefList.yaml
Cosmin Sabou 26e6b5110c Backed out 8 changesets (bug 1691578) for bc failures on browser_decoderDoctor.js. CLOSED TREE 
Backed out changeset c535dd429ada (bug 1691578)
Backed out changeset 518eadda7826 (bug 1691578)
Backed out changeset c181e29b13f2 (bug 1691578)
Backed out changeset 23f6dcc3ceb5 (bug 1691578)
Backed out changeset bfd3e4878545 (bug 1691578)
Backed out changeset 214ab3a2f00b (bug 1691578)
Backed out changeset 71a17ff3322c (bug 1691578)
Backed out changeset 6aa662e8d06e (bug 1691578)
2021-02-25 21:08:07 +02:00

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# 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: <pref-name> # mandatory
# type: <cpp-type> # mandatory
# value: <default-value> # mandatory
# mirror: <never | once | always> # mandatory
# do_not_use_directly: <true | false> # optional
# include: <header-file> # optional
# rust: <true | false> # 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, or `String`. 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<bool, Relaxed>`.
#
# - `value` is the default value. Its type should be appropriate for
# <cpp-type>, 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. `<cmath>`.
#
# - `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.font-display.enabled")`.
#
# 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
#ifdef ANDROID
#define IS_ANDROID true
#define IS_NOT_ANDROID false
#else
#define IS_ANDROID false
#define IS_NOT_ANDROID true
#endif
#---------------------------------------------------------------------------
# Prefs starting with "accessibility."
#---------------------------------------------------------------------------
- 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.ARIAReflection.enabled
type: bool
value: false
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
#ifdef XP_WIN
# Linux and macOS turn on system level notification as default, but Windows is
# disabled due to instability (dependencies of bug 1497425).
value: false
#else
value: true
#endif
mirror: always
#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: bool
value: true
mirror: always
- name: android.touch_resampling.enabled
type: RelaxedAtomicBool
value: true
mirror: always
#endif
#---------------------------------------------------------------------------
# Prefs starting with "apz."
# The apz prefs are explained in AsyncPanZoomController.cpp
#---------------------------------------------------------------------------
- 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.nonwr.activate_all_scroll_frames
type: RelaxedAtomicBool
value: false
mirror: always
- name: apz.nonwr.activate_all_scroll_frames_when_fission
type: RelaxedAtomicBool
value: false
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.allow_immediate_handoff
type: RelaxedAtomicBool
value: false
mirror: always
- name: apz.allow_zooming
type: RelaxedAtomicBool
value: true
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: <cmath>
- 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: <cmath>
- name: apz.axis_lock.lock_angle
type: AtomicFloat
value: float(M_PI / 6.0) # 30 degrees
mirror: always
include: <cmath>
# Whether to lock touch scrolling to one axis at a time.
# 0 = FREE (No locking at all)
# 1 = STANDARD (Once locked, remain locked until scrolling ends)
# 2 = STICKY (Allow lock to be broken, with hysteresis)
- name: apz.axis_lock.mode
type: RelaxedAtomicInt32
value: 2
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.initial.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
# new scrollbar code for desktop zooming
- name: apz.force_disable_desktop_zooming_scrollbars
type: RelaxedAtomicBool
value: false
mirror: always
#ifdef MOZ_WIDGET_GTK
- name: apz.gtk.kinetic_scroll.enabled
type: RelaxedAtomicBool
value: true
mirror: always
- name: apz.gtk.touchpad_pinch.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.mvm.force-enabled
type: RelaxedAtomicBool
value: true
mirror: always
- name: apz.one_touch_pinch.enabled
type: RelaxedAtomicBool
value: @IS_ANDROID@
mirror: always
- name: apz.overscroll.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.paint_skipping.enabled
type: RelaxedAtomicBool
value: true
mirror: always
- name: apz.peek_messages.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# Fetch displayport updates early from the message queue.
- name: apz.pinch_lock.mode
type: RelaxedAtomicInt32
value: 1
mirror: always
- name: apz.pinch_lock.scroll_lock_threshold
type: AtomicFloat
value: 1.0f / 32.0f # 1/32 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: 50 # 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
- 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_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.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
value: 250
mirror: always
- name: apz.scale_repaint_delay_ms
type: RelaxedAtomicInt32
value: 500
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
#---------------------------------------------------------------------------
# Prefs starting with "browser."
#---------------------------------------------------------------------------
- name: browser.active_color
type: String
value: "#EE0000"
mirror: never
- name: browser.anchor_color
type: String
value: "#0000EE"
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.offline.enable
type: bool
value: @IS_NOT_EARLY_BETA_OR_EARLIER@
mirror: always
- name: browser.cache.offline.storage.enable
type: bool
value: false
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
# 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
- 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
- name: browser.display.background_color
type: String
value: "#FFFFFF"
mirror: never
# 0 = always, except in high contrast mode
# 1 = always
# 2 = never
#
# Default to 0 on windows, 1 elsewhere.
- name: browser.display.document_color_use
type: RelaxedAtomicUint32
#ifdef XP_WIN
value: 0
#else
value: 1
#endif
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.focus_ring_on_anything
type: bool
value: false
mirror: always
- name: browser.display.focus_ring_width
type: uint32_t
value: 1
mirror: always
- name: browser.display.focus_background_color
type: String
value: "#117722"
mirror: never
# Focus ring border style.
# 0 = solid border, 1 = dotted border
- name: browser.display.focus_ring_style
type: uint32_t
value: 1
mirror: always
- name: browser.display.focus_text_color
type: String
value: "#ffffff"
mirror: never
- name: browser.display.foreground_color
type: String
value: "#000000"
mirror: never
# Whether focus rings are always shown by default.
#
# This is the initial value of nsWindowRoot::mShowFocusRings, but it can be
# overridden by system preferences. For Windows, we start with default-true,
# and by default the UISF_HIDEFOCUS message comes by and sets it to false.
- name: browser.display.show_focus_rings
type: bool
#ifndef XP_WIN
value: false
#else
value: true
#endif
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
- name: browser.display.use_focus_colors
type: bool
value: false
mirror: always
- name: browser.display.use_system_colors
type: bool
value: false
mirror: always
- name: browser.dom.window.dump.enabled
type: RelaxedAtomicBool
value: @IS_NOT_MOZILLA_OFFICIAL@
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
# 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
# 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: false
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
# 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
# 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
# Password protection
- name: browser.safebrowsing.passwords.enabled
type: bool
value: false
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
# ContentSessionStore 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
# 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
- name: browser.tabs.remote.desktopbehavior
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
#if !defined(ANDROID)
value: true
#else
value: false # Blocked by DocumentChannel, see Bug 1589982.
#endif
mirror: always
# 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
#if !defined(ANDROID)
value: true
#else
value: false # Blocked by DocumentChannel, see Bug 1589982.
#endif
mirror: always
# When true, zooming will be enabled on all sites, even ones that declare
# user-scalable=no.
- name: browser.ui.zoom.force-user-scalable
type: RelaxedAtomicBool
value: false
mirror: always
- name: browser.underline_anchors
type: bool
value: true
mirror: always
- name: browser.viewport.desktopWidth
type: RelaxedAtomicInt32
value: 980
mirror: always
- name: browser.visited_color
type: String
value: "#551A8B"
mirror: never
#---------------------------------------------------------------------------
# Prefs starting with "canvas."
#---------------------------------------------------------------------------
# Limit for the canvas image cache. 0 means unlimited.
- name: canvas.image.cache.limit
type: int32_t
value: 0
mirror: always
# Add support for canvas path objects
- name: canvas.path.enabled
type: bool
value: true
mirror: always
- name: canvas.capturestream.enabled
type: bool
value: true
mirror: always
# Is support for CanvasRenderingContext2D.filter enabled?
- name: canvas.filters.enabled
type: bool
value: true
mirror: always
# Provide ability to turn on support for canvas focus rings.
- name: canvas.focusring.enabled
type: bool
value: true
mirror: always
# Is support for CanvasRenderingContext2D's hitRegion APIs enabled?
- name: canvas.hitregions.enabled
type: bool
value: false
mirror: always
# Is support for CanvasRenderingContext2D's createConicGradient API enabled?
- name: canvas.createConicGradient.enabled
type: RelaxedAtomicBool
value: @IS_NIGHTLY_BUILD@
mirror: always
# Provide ability to turn on support for canvas mozGetAsFile API.
- name: canvas.mozgetasfile.enabled
type: bool
value: false
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
#---------------------------------------------------------------------------
# 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.
- 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: 360000
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 "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
- 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
- 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."
#---------------------------------------------------------------------------
# Tells if DevTools have been explicitely enabled by the user. This pref
# allows to disable all features related to DevTools for users that never use
# them. Until bug 1361080 lands, we always consider them enabled.
- name: devtools.enabled
type: RelaxedAtomicBool
value: true
mirror: always
- 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
- name: devtools.toolbox.force-chrome-prefs
type: RelaxedAtomicBool
value: true
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: false
mirror: always
# If true, page with beforeunload or unload event listeners can be bfcached.
- name: docshell.shistory.bfcache.allow_unload_listeners
type: bool
value: false
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "dom."
#---------------------------------------------------------------------------
# Whether window.mozPaintCount is exposed to the web.
- name: dom.mozPaintCount.enabled
type: bool
value: false
mirror: always
# Allow cut/copy
- name: dom.allow_cut_copy
type: bool
value: true
mirror: always
- name: dom.allow_XUL_XBL_for_file
type: bool
value: false
mirror: always
# Checks if offscreen animation throttling is enabled.
- name: dom.animations.offscreen-throttling
type: bool
value: true
mirror: always
# Is support for automatically removing replaced filling animations enabled?
- name: dom.animations-api.autoremove.enabled
type: bool
value: true
mirror: always
# Is support for composite operations from the Web Animations API enabled?
- name: dom.animations-api.compositing.enabled
type: bool
value: true
mirror: always
# Is support for the core interfaces of Web Animations API enabled?
- name: dom.animations-api.core.enabled
type: bool
value: true
mirror: always
# Is support for Document.getAnimations() and Element.getAnimations()
# supported?
- name: dom.animations-api.getAnimations.enabled
type: bool
value: true
mirror: always
# Is support for animations from the Web Animations API without 0%/100%
# keyframes enabled?
- name: dom.animations-api.implicit-keyframes.enabled
type: bool
value: true
mirror: always
# Is support for timelines from the Web Animations API enabled?
- name: dom.animations-api.timelines.enabled
type: bool
value: true
mirror: always
# Synchronize transform animations with geometric animations on the
# main thread.
- name: dom.animations.mainthread-synchronization-with-geometric-animations
type: bool
value: @IS_NOT_NIGHTLY_BUILD@
mirror: always
# Is support for AudioWorklet enabled?
- name: dom.audioworklet.enabled
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 Insecure downloads from Secure Origins
- name: dom.block_download_insecure
type: bool
value: @IS_NIGHTLY_BUILD@
mirror: always
# Block all downloads in iframes with the sandboxed attribute
- name: dom.block_download_in_sandboxed_iframes
type: bool
value: true
mirror: always
# Block multiple window.open() per single event.
- name: dom.block_multiple_popups
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: 20
mirror: always
# Whether window.location.reload() and window.history.go(0) should be blocked
# if called directly from a window resize event handler.
#
# This used to be necessary long ago to prevent terrible UX when using stuff
# like TypeAheadFind (bug 258917), but it also causes compat issues on mobile
# (bug 1570566).
#
# So for now disable it on Android and Desktop Nightly, to see if we have any
# desktop regression before removing it completely. Note that this means that
# non-nightly RDM behaves different than Android in this case.
- name: dom.block_reload_from_resize_event_handler
type: bool
#if defined(MOZ_WIDGET_ANDROID) || defined(NIGHTLY_BUILD)
value: false
#else
value: true
#endif
mirror: always
# SW Cache API
- name: dom.caches.enabled
type: RelaxedAtomicBool
value: true
mirror: always
- name: dom.caches.testing.enabled
type: RelaxedAtomicBool
value: false
mirror: always
# Disable capture attribute for input elements; only supported on GeckoView.
- name: dom.capture.enabled
type: bool
value: false
mirror: always
# 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
# 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.
- name: dom.delay.block_external_protocol_in_iframes.enabled
type: bool
value: @IS_NOT_NIGHTLY_BUILD@
mirror: always
# HTML <dialog> element
- name: dom.dialog_element.enabled
type: bool
value: @IS_NIGHTLY_BUILD@
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
# If set this to true, `Document.execCommand` may be performed nestedly.
# Otherwise, nested calls just return false.
- name: dom.document.exec_command.nested_calls_allowed
type: bool
value: false
mirror: always
- name: dom.enable_window_print
type: bool
value: @IS_NOT_ANDROID@
mirror: always
- name: dom.element.transform-getters.enabled
type: bool
value: false
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: @IS_NIGHTLY_BUILD@
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
# 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 touch event listeners are passive by default.
- name: dom.event.default_to_passive_touch_listeners
type: bool
value: true
mirror: always
# Whether wheel listeners are passive by default.
- name: dom.event.default_to_passive_wheel_listeners
type: bool
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: @IS_NIGHTLY_BUILD@
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
# When dom.event.wheel-deltaMode-lines.disabled is true, this is the lines to
# pixels multiplier that gets used.
#
# The value here is taken from PIXELS_PER_LINE_SCALE from pdf.js.
- name: dom.event.wheel-deltaMode-lines-to-pixel-scale
type: uint32_t
value: 30
mirror: always
#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 .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
# Enable clipboard readText() and writeText() by default
- name: dom.events.asyncClipboard
type: bool
value: true
mirror: always
# Disable ClipboardItem and clipboard.read/write by default
- name: dom.events.asyncClipboard.clipboardItem
type: bool
value: false
mirror: always
# 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
# 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
# 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
# Whether to expose test interfaces of various sorts
- name: dom.expose_test_interfaces
type: bool
value: false
mirror: always
- name: dom.fetchObserver.enabled
type: RelaxedAtomicBool
value: false
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
# 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
# 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: bool
value: false
mirror: always
# W3C draft ImageCapture API
- name: dom.imagecapture.enabled
type: bool
value: false
mirror: always
# <img loading="lazy">
#
# See https://github.com/whatwg/html/pull/3752
- name: dom.image-lazy-loading.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# The root margin for image lazy loading, defined as four (value, percentage)
# pairs.
#
# (0px, 0px, 0px, 0px) by default, for now. We could also consider an
# adaptative version of this.
- name: dom.image-lazy-loading.root-margin.top
type: float
value: 300
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: 300
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: 300
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: 300
mirror: always
- name: dom.image-lazy-loading.root-margin.right.percentage
type: bool
value: false
mirror: always
# Enable passing the "storage" option to indexedDB.open.
- name: dom.indexedDB.storageOption.enabled
type: RelaxedAtomicBool
value: false
mirror: always
# Enable indexedDB in private browsing mode.
- name: dom.indexedDB.privateBrowsing.enabled
type: RelaxedAtomicBool
value: false
mirror: always
- name: dom.input_events.beforeinput.enabled
type: bool
value: true
mirror: always
# Whether innerWidth / innerHeight return rounded or fractional sizes.
#
# 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.rounded
type: bool
value: true
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
# Enable not moving the cursor to end when a text input or textarea has .value
# set to the value it already has. By default, enabled.
- name: dom.input.skip_cursor_move_for_same_value_set
type: bool
value: true
mirror: always
- name: dom.IntersectionObserver.enabled
type: bool
value: true
mirror: always
- name: dom.IntersectionObserverExplicitDocumentRoot.enabled
type: bool
value: true
mirror: always
- name: dom.ipc.cancel_content_js_when_navigating
type: bool
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
value: false
mirror: once
#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
# Allow Flash async drawing mode in 64-bit release builds.
- name: dom.ipc.plugins.asyncdrawing.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# How long we wait before unloading an idle plugin process.
- name: dom.ipc.plugins.unloadTimeoutSecs
type: RelaxedAtomicUint32
value: 30
mirror: always
- name: dom.ipc.plugins.allow_dxgi_surface
type: bool
value: true
mirror: always
# 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
- name: dom.ipc.tabs.disabled
type: bool
value: false
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
# 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
- name: dom.ipc.processPriorityManager.enabled
type: bool
value: false
mirror: always
- name: dom.ipc.processPriorityManager.testMode
type: bool
value: false
mirror: always
- name: dom.ipc.processPriorityManager.backgroundPerceivableGracePeriodMS
type: uint32_t
value: 0
mirror: always
- name: dom.ipc.processPriorityManager.backgroundGracePeriodMS
type: uint32_t
value: 0
mirror: always
# Is support for HTMLElement.autocapitalize enabled?
- name: dom.forms.autocapitalize
type: bool
value: @IS_NIGHTLY_BUILD@
mirror: always
# Support for input type=month, type=week and type=datetime-local. By default,
# disabled.
- name: dom.forms.datetime.others
type: bool
value: @IS_ANDROID@
mirror: always
# Is support for HTMLElement.enterKeyHint enabled?
- name: dom.forms.enterkeyhint
type: bool
value: @IS_NIGHTLY_BUILD@
mirror: always
# Is support for HTMLElement.inputMode enabled?
- name: dom.forms.inputmode
type: bool
#if defined(ANDROID)
value: true
#else
value: @IS_NOT_RELEASE_OR_BETA@
#endif
mirror: always
# Enable Directory API. By default, disabled.
- name: dom.input.dirpicker
type: bool
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
# 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 the Large-Allocation header is enabled.
- name: dom.largeAllocationHeader.enabled
type: bool
value: true
mirror: always
- name: dom.largeAllocation.forceEnable
type: bool
value: false
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
# This pref is used to enable/disable the `document.autoplayPolicy` API which
# returns a enum string which presents current autoplay policy and can change
# overtime based on user session activity.
- name: dom.media.autoplay.autoplay-policy-api
type: bool
value: false
mirror: always
# Media Session API
- name: dom.media.mediasession.enabled
type: bool
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
- name: dom.menuitem.enabled
type: bool
value: false
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: int32_t
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
# Is support for module scripts (<script type="module">) enabled for content?
- name: dom.moduleScripts.enabled
type: bool
value: true
mirror: always
# Whether we disable triggering mutation events for changes to style
# attribute via CSSOM.
# 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.mutation-events.cssom.disabled
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.locationChangeRateLimit.count
type: uint32_t
value: 200
mirror: always
# Time span in seconds for location change rate limit.
- name: dom.navigation.locationChangeRateLimit.timespan
type: uint32_t
value: 10
mirror: always
# Network Information API
- name: dom.netinfo.enabled
type: RelaxedAtomicBool
value: @IS_ANDROID@
mirror: always
# Whether we should open noopener links in a new process.
- name: dom.noopener.newprocess.enabled
type: bool
value: true
mirror: always
# Whether we shouldn't show an error page for unknown protocols (and should
# show a console warning instead).
- name: dom.no_unknown_protocol_error.enabled
type: bool
value: true
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
- name: dom.performance.children_results_ipc_timeout
type: uint32_t
value: 1000
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.timeToDOMContentFlushed enabled?
- name: dom.performance.time_to_dom_content_flushed.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 Permissions.revoke enabled?
- name: dom.permissions.revoke.enable
type: bool
value: false
mirror: always
# Whether we should show the placeholder when the element is focused but empty.
- name: dom.placeholder.show_on_focus
type: bool
value: true
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
#if !defined(ANDROID)
value: true
#else
value: false # Blocked by DocumentChannel, see Bug 1589982.
#endif
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
# Presentation API
- name: dom.presentation.enabled
type: bool
#if defined(ANDROID)
value: @IS_NOT_RELEASE_OR_BETA@
#else
value: false
#endif
mirror: always
- name: dom.presentation.controller.enabled
type: bool
#if defined(ANDROID)
value: @IS_NOT_RELEASE_OR_BETA@
#else
value: false
#endif
mirror: always
- name: dom.presentation.receiver.enabled
type: bool
#if defined(ANDROID)
value: @IS_NOT_RELEASE_OR_BETA@
#else
value: false
#endif
mirror: always
- name: dom.presentation.testing.simulate-receiver
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: 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
# 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
# Preference that users can set to override temporary storage smart limit
# calculation.
- name: dom.quotaManager.temporaryStorage.fixedLimit
type: RelaxedAtomicInt32
value: -1
mirror: always
# Preference that users can set to override temporary storage smart limit
# calculation.
- name: dom.quotaManager.temporaryStorage.chunkSize
type: RelaxedAtomicUint32
value: 10 * 1024
mirror: always
# A pref that is used to enable testing features.
- name: dom.quotaManager.testing
type: SequentiallyConsistentAtomicBool
value: false
mirror: always
#ifdef 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
# TelemetryVFS.
- name: dom.quotaManager.overrideXFullPathname
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
# Reporting API.
- name: dom.reporting.enabled
type: RelaxedAtomicBool
value: @IS_NIGHTLY_BUILD@
mirror: always
- name: dom.reporting.testing.enabled
type: RelaxedAtomicBool
value: false
mirror: always
- name: dom.reporting.featurePolicy.enabled
type: RelaxedAtomicBool
value: @IS_NIGHTLY_BUILD@
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 requestIdleCallback API
- name: dom.requestIdleCallback.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
# Is support for decoding external (non-inline) classic or module DOM scripts
# (i.e. anything but workers) as UTF-8, then directly compiling without
# inflating to UTF-16, enabled?
- name: dom.script_loader.external_scripts.utf8_parsing.enabled
type: bool
value: true
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
- name: dom.securecontext.whitelist_onions
type: bool
value: false
mirror: always
# This pref enables Sec-Fetch-* logic and causes corresponding
# request headers to be set.
- name: dom.security.secFetch.enabled
type: RelaxedAtomicBool
value: @IS_NIGHTLY_BUILD@
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
# 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 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
# 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
- name: dom.security.unexpected_system_load_telemetry_enabled
type: bool
value: true
mirror: always
# pref controls `Sanitizer` API being exposed
- name: dom.security.sanitizer.enabled
type: bool
value: false
mirror: always
# Is support for selection event APIs enabled?
- name: dom.select_events.enabled
type: bool
value: true
mirror: always
# Whether or not selection events on text controls are enabled.
- name: dom.select_events.textcontrols.enabled
type: bool
value: @IS_NIGHTLY_BUILD@
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: false
mirror: always
# If true. then the service worker interception and the ServiceWorkerManager
# will live in the parent process. This only takes effect on browser start.
- name: dom.serviceWorkers.parent_intercept
type: bool
value: true
mirror: never
- name: dom.serviceWorkers.testing.enabled
type: RelaxedAtomicBool
value: false
mirror: always
- name: dom.workers.serialized-sab-access
type: RelaxedAtomicBool
value: false
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: false
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
# Enable Storage API for all platforms except Android.
- name: dom.storageManager.enabled
type: RelaxedAtomicBool
value: @IS_NOT_ANDROID@
mirror: always
# Should we abort LocalStorage requests when a sync message from parent is
# detected?
#
# LocalStorage is a synchronous API involving sync IPC from the child to the
# parent. Accessibility interfaces currently also involve different forms of
# synchronous parent-to-child communication. (See bug 1516136 comment 11 and
# comment 15.) Although LocalStorage NextGen no longer needs to consult the
# main thread, thereby eliminating the possibility of deadlock, the browser is
# very complex and so we have retained a fail-safe mechanism that will cause
# blocking LocalStorage operations to abort on synchronous IPC from the parent
# to the child.
#
# We are disabling this fail-safe mechanism because it is fundamentally visible
# to content when activated. When we abort the synchronous LocalStorage
# operation we throw an error which has the potential to break web content.
# This is not a hypothetical. In bug 1574569 content broke due to accessibility
# path aborting the LS call, but the LS call didn't need to abort because it
# was not at risk of deadlock.
#
# But we are retaining the preference in the event that regressions occur
# anywhere in the code-base that could cause a cascade that would result in
# deadlock. (There have been logic bugs in components that resulted in
# PBackground synchronously blocking in a way that could result in deadlock.)
# This allows us to re-enable the fail-safe with only a pref flip.
- name: dom.storage.abort_on_sync_parent_to_child_messages
type: bool
value: false
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 LSNG (Next Generation Local Storage) is enabled.
# See bug 1517090 for enabling this on Nightly.
# See bug 1534736 for changing it to EARLY_BETA_OR_EARLIER.
# See bug 1539835 for enabling this unconditionally.
# See bug 1619948 for changing it back to EARLY_BETA_OR_EARLIER.
- name: dom.storage.next_gen
type: RelaxedAtomicBool
value: @IS_EARLY_BETA_OR_EARLIER@
mirror: always
do_not_use_directly: true
# Is support for Storage test APIs enabled?
- name: dom.storage.testing
type: bool
value: false
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
- name: dom.testing.sync-content-blocking-notifications
type: bool
value: false
mirror: always
- name: dom.textMetrics.actualBoundingBox.enabled
type: bool
value: true
mirror: always
- name: dom.textMetrics.baselines.enabled
type: bool
value: false
mirror: always
- name: dom.textMetrics.emHeight.enabled
type: bool
value: false
mirror: always
- name: dom.textMetrics.fontBoundingBox.enabled
type: bool
value: false
mirror: always
# Time (in ms) that it takes to regenerate 1ms.
- name: dom.timeout.background_budget_regeneration_rate
type: int32_t
value: 100
mirror: always
# Time (in ms) that it takes to regenerate 1ms.
- name: dom.timeout.foreground_budget_regeneration_rate
type: int32_t
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: int32_t
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: int32_t
value: -1
mirror: always
# The maximum amount a timeout can be delayed by budget throttling.
- name: dom.timeout.budget_throttling_max_delay
type: int32_t
value: 15000
mirror: always
# Turn on budget throttling by default.
- name: dom.timeout.enable_budget_timer_throttling
type: bool
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: uint32_t
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: int32_t
value: 30000
mirror: always
# UDPSocket API
- name: dom.udpsocket.enabled
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 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: true
mirror: always
- name: dom.vibrator.max_vibrate_ms
type: uint32_t
value: 10000
mirror: always
- name: dom.vibrator.max_vibrate_list_len
type: uint32_t
value: 128
mirror: always
# Is support for Window.visualViewport enabled?
- name: dom.visualviewport.enabled
type: bool
value: false
mirror: always
# Is support for WebVR APIs enabled?
# Enabled by default in beta and release for Windows and OS X and for all
# platforms in nightly and aurora.
- name: dom.vr.enabled
type: RelaxedAtomicBool
#if defined(XP_WIN) || defined(XP_DARWIN) || !defined(RELEASE_OR_BETA)
value: true
#else
value: false
#endif
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
# navigatior.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
# navigatior.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
#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: false
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
# W3C pointer events draft.
- name: dom.w3c_pointer_events.implicit_capture
type: bool
value: @IS_NIGHTLY_BUILD@
mirror: always
# Is support for Navigator.webdriver enabled?
- name: dom.webdriver.enabled
type: bool
value: true
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
# 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 form-associated custom element enabled?
- name: dom.webcomponents.formAssociatedCustomElement.enabled
type: bool
value: @IS_NIGHTLY_BUILD@
mirror: always
# Is support for the Web GPU API enabled?
- name: dom.webgpu.enabled
type: RelaxedAtomicBool
value: false
mirror: always
# 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: false
mirror: always
- name: dom.webnotifications.allowinsecure
type: RelaxedAtomicBool
value: false
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.requireuserinteraction
type: RelaxedAtomicBool
value: true
mirror: always
- name: dom.webnotifications.requireinteraction.enabled
type: RelaxedAtomicBool
value: @IS_NIGHTLY_BUILD@
mirror: always
- name: dom.webnotifications.serviceworker.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# Is support for Window.event enabled?
- name: dom.window.event.enabled
type: bool
value: true
mirror: always
- name: dom.window.history.async
type: bool
value: true
mirror: always
# Enable the "noreferrer" feature argument for window.open()
- name: dom.window.open.noreferrer.enabled
type: bool
value: true
mirror: always
- name: dom.window.content.untrusted.enabled
type: bool
value: @IS_NOT_EARLY_BETA_OR_EARLIER@
mirror: always
- name: dom.worker.canceling.timeoutMilliseconds
type: RelaxedAtomicUint32
value: 30000 # 30 seconds
mirror: always
# Is support for compiling DOM worker scripts directly from UTF-8 (without ever
# inflating to UTF-16) enabled?
- name: dom.worker.script_loader.utf8_parsing.enabled
type: RelaxedAtomicBool
value: true
mirror: always
- name: dom.worker.use_medium_high_event_queue
type: RelaxedAtomicBool
value: true
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.worklet.enabled
type: bool
value: true
mirror: always
# Enable content type normalization of XHR uploads via MIME Sniffing standard
- name: dom.xhr.standard_content_type_normalization
type: RelaxedAtomicBool
value: true
mirror: always
# When this pref is set, parent documents may consider child iframes have
# loaded while they are still loading.
- name: dom.cross_origin_iframes_loaded_in_background
type: bool
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
value: false
mirror: always
# WebShare API - allows WebShare without user interaction (for tests only).
- name: dom.webshare.requireinteraction
type: bool
value: true
mirror: always
# about:home and about:newtab include remote snippets that contain arbitrarily
# placed anchor tags in their content; we want sanitization to be turned off
# in order to render them correctly
- name: dom.about_newtab_sanitization.enabled
type: bool
value: false
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 four prefs control the maximum script run time before slow
# script warning.
- name: dom.max_script_run_time
type: int32_t
value: 10
mirror: always
- name: dom.max_script_run_time_without_important_user_input
type: int32_t
#ifdef NIGHTLY_BUILD
value: 20
#else
value: 10
#endif
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
#---------------------------------------------------------------------------
# Prefs starting with "editor"
#---------------------------------------------------------------------------
# Allow or disallow to delete `<hr>` element when caret is at start of
# following line of the element. If false, Backspace from start of following
# line of an `<hr>` element causes moving caret to immediatly after the `<hr>`
# element, and then, another Backspace can delete it.
- name: editor.hr_element.allow_to_delete_from_following_line
type: bool
value: false
mirror: always
# 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
# 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
# Whether user pastes should be truncated.
- name: editor.truncate_user_pastes
type: bool
value: true
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 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
#---------------------------------------------------------------------------
# Prefs starting with "extensions."
#---------------------------------------------------------------------------
# Private browsing opt-in is only supported on Firefox desktop.
- name: extensions.allowPrivateBrowsingByDefault
type: bool
value: false
mirror: always
# Whether the background.service_worker in the extension manifest.json file
# is enabled.
- name: extensions.backgroundServiceWorker.enabled
type: bool
value: false
mirror: once
# 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: 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
#---------------------------------------------------------------------------
# Prefs starting with "findbar."
#---------------------------------------------------------------------------
- name: findbar.modalHighlight
type: bool
value: false
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
# if fission is enabled by default.
- name: fission.autostart
type: bool
value: false
mirror: never
# Prefs used by normandy to orchestrate the fission experiment. For more
# details, see the comments in nsAppRunner.cpp.
- name: fission.experiment.enrollmentStatus
type: uint32_t
value: 0
mirror: never
- name: fission.experiment.startupEnrollmentStatus
type: uint32_t
value: 0
mirror: never
# This pref has no effect within fission windows, it only controls the
# behaviour within non-fission windows. If true, preserve browsing contexts
# between process swaps.
- name: fission.preserve_browsing_contexts
type: bool
value: true
mirror: always
# Store the session history in the parent process, and access it over IPC
# from the child processes.
- name: fission.sessionHistoryInParent
type: bool
value: false
mirror: once
do_not_use_directly: true
# Allow renaming of process names to the origin on nightly
# Setting this pref creates a privacy leak, but helps greatly with
# debugging
- name: fission.processOriginNames
type: bool
value: false
mirror: always
# If true, allow process-switching documents loaded by <object> and <embed>
# elements into a remote process.
# NOTE: This pref has no impact outside of windows with the
# `useRemoteSubframes` flag set.
- name: fission.remoteObjectEmbed
type: bool
value: true
mirror: always
# If true, show option for opening a non-Fission window in a menu, when Fission
# is enabled.
- name: fission.openNonFissionWindowOption
type: bool
value: false
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
# This setting corresponds to a global text zoom setting affecting
# all content that is not already subject to font size inflation.
# It is interpreted as a percentage value that is applied on top
# of the document's current text zoom setting.
#
# The resulting total zoom factor (text zoom * system font scale)
# will be limited by zoom.minPercent and maxPercent.
- name: font.size.systemFontScale
type: uint32_t
value: 100
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "full-screen-api."
#---------------------------------------------------------------------------
- name: full-screen-api.enabled
type: bool
value: false
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
#---------------------------------------------------------------------------
# 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
value: false
mirror: always
- name: fuzzing.necko.enabled
type: RelaxedAtomicBool
value: false
mirror: always
#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.mouseWheel.migrationPercent
type: RelaxedAtomicInt32
value: 100
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: false
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
#---------------------------------------------------------------------------
# Prefs starting with "gfx."
#---------------------------------------------------------------------------
- name: gfx.allow-texture-direct-mapping
type: bool
value: true
mirror: once
# 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
# Nb: we ignore this pref on release and beta.
- name: gfx.blocklist.all
type: int32_t
value: 0
mirror: once
# 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: RelaxedAtomicBool
#if defined(XP_WIN)
value: true
#else
value: false
#endif
mirror: always
- name: gfx.color_management.force_srgb
type: RelaxedAtomicBool
value: false
mirror: always
- name: gfx.color_management.enablev4
type: RelaxedAtomicBool
value: false
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.compositor.clearstate
type: RelaxedAtomicBool
value: false
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
#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: false
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
# Whether to defer destruction of Direct2D DrawTargets to the paint thread
# when using OMTP.
- name: gfx.direct2d.destroy-dt-on-paintthread
type: RelaxedAtomicBool
value: true
mirror: always
- name: gfx.direct3d11.reuse-decoder-device
type: RelaxedAtomicInt32
value: -1
mirror: always
- 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
# 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 font sanitization is performed on the main thread or not.
- name: gfx.downloadable_fonts.sanitize_omt
type: RelaxedAtomicBool
value: true
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.draw-color-bars
type: RelaxedAtomicBool
value: false
mirror: always
- name: gfx.e10s.hide-plugins-for-scroll
type: bool
value: true
mirror: once
- name: gfx.e10s.font-list.shared
type: bool
value: @IS_EARLY_BETA_OR_EARLIER@
mirror: once
# Whether to load fonts (e.g. Twemoji Mozilla) bundled with the application:
# -1 - Auto behavior based on OS version (currently, disables loading on Win8.1 or later,
# or 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: uint32_t
#if defined(XP_WIN)
value: 60000
#else
value: 8000
#endif
mirror: once
# Disable antialiasing of Ahem, for use in tests.
- name: gfx.font_rendering.ahem_antialias_none
type: RelaxedAtomicBool
value: false
mirror: always
#if defined(XP_MACOSX)
# 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.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 enable LayerScope tool and default listening port.
- name: gfx.layerscope.enabled
type: RelaxedAtomicBool
value: false
mirror: always
- name: gfx.layerscope.port
type: RelaxedAtomicInt32
value: 23456
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
- name: gfx.logging.painted-pixel-count.enabled
type: RelaxedAtomicBool
value: false
mirror: always
# 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)500000000
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.enabled
type: RelaxedAtomicBool
value: false
mirror: always
- name: gfx.omta.background-color
type: bool
value: true
mirror: always
- name: gfx.partialpresent.force
type: RelaxedAtomicInt32
value: 0
mirror: always
# 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
# Prefer EGL over GLX if available.
- name: gfx.prefer-x11-egl
type: bool
value: false
mirror: once
- name: gfx.testing.device-fail
type: RelaxedAtomicBool
value: false
mirror: always
- name: gfx.testing.device-reset
type: RelaxedAtomicInt32
value: 0
mirror: always
- 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
# Disable surface sharing due to issues with compatible FBConfigs on
# NVIDIA drivers as described in bug 1193015.
- name: gfx.use-glx-texture-from-pixmap
type: RelaxedAtomicBool
value: false
mirror: always
- name: gfx.use-iosurface-textures
type: bool
value: false
mirror: once
- name: gfx.use-mutex-on-present
type: bool
value: false
mirror: once
- name: gfx.use-ahardwarebuffer-content
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.collect-scroll-transforms
type: RelaxedAtomicBool
value: false
mirror: always
- 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
# We expose two prefs: gfx.webrender.all and gfx.webrender.enabled.
# The first enables WR+additional features, and the second just enables WR.
# For developer convenience, building with --enable-webrender=true or just
# --enable-webrender will set gfx.webrender.enabled to true by default.
#
# We also have a pref gfx.webrender.all.qualified which is not exposed via
# about:config. That pref enables WR but only on qualified hardware. This is
# the pref we'll eventually flip to deploy WebRender to the target population.
- name: gfx.webrender.all
type: bool
value: false
mirror: once
- name: gfx.webrender.enabled
type: bool
value: false
mirror: once
do_not_use_directly: true
#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.blob-images
type: RelaxedAtomicBool
value: true
mirror: always
- name: gfx.webrender.svg-images
type: RelaxedAtomicBool
value: false
mirror: always
- name: gfx.webrender.blob.paint-flashing
type: RelaxedAtomicBool
value: false
mirror: always
- name: gfx.webrender.enable-capture
type: bool
#ifdef NIGHTLY_BUILD
value: true
#else
value: false
#endif
mirror: once
- name: gfx.webrender.dl.dump-parent
type: RelaxedAtomicBool
value: false
mirror: always
- name: gfx.webrender.dl.dump-content
type: RelaxedAtomicBool
value: false
mirror: always
- name: gfx.webrender.dl.dump-content-serialized
type: RelaxedAtomicBool
value: false
mirror: always
# Also expose a pref to allow users to force-disable WR. This is exposed
# on all channels because WR can be enabled on qualified hardware on all
# channels.
- name: gfx.webrender.force-disabled
type: bool
value: false
mirror: once
- name: gfx.webrender.highlight-painted-layers
type: RelaxedAtomicBool
value: false
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.enable-multithreading
type: bool
value: true
mirror: always
- name: gfx.webrender.batching.lookback
type: uint32_t
value: 10
mirror: always
- name: gfx.webrender.compositor
type: bool
#if defined(XP_WIN) || defined(XP_MACOSX)
value: true
#else
value: false
#endif
mirror: once
- name: gfx.webrender.compositor.force-enabled
type: bool
value: false
mirror: once
- name: gfx.webrender.compositor.max_update_rects
type: uint32_t
#if defined(XP_WIN) || defined(XP_MACOSX)
value: 1
#else
value: 0
#endif
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
- 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/WebRender Software to Basic.
- name: gfx.webrender.fallback.basic
type: bool
value: true
mirror: once
# Whether or not to fallback from WebRender to Software WebRender.
- name: gfx.webrender.fallback.software
type: bool
value: @IS_NIGHTLY_BUILD@
mirror: once
#ifdef XP_WIN
# Whether or not to fallback from WebRender to Software WebRender + D3D11.
- name: gfx.webrender.fallback.software-d3d11
type: bool
value: @IS_NIGHTLY_BUILD@
mirror: once
#endif
- 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 NIGHTLY_BUILD
# Keep this pref hidden on non-nightly builds to avoid people accidentally
# turning it on.
- name: gfx.webrender.start-debug-server
type: RelaxedAtomicBool
value: false
mirror: always
#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
- 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
#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
# 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.d3d11.upload-mode
type: RelaxedAtomicInt32
value: 4
mirror: always
# Whether to allow widgets that don't support acceleration to use WebRender
# software backend
- name: gfx.webrender.software.unaccelerated-widget.allow
type: RelaxedAtomicBool
value: false
mirror: always
# Whether to force widgets that don't support acceleration to use WebRender
# software backend
- name: gfx.webrender.software.unaccelerated-widget.force
type: RelaxedAtomicBool
value: false
mirror: always
# 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
#---------------------------------------------------------------------------
# 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."
#---------------------------------------------------------------------------
# Turn HTML:inert on or off.
- name: html5.inert.enabled
type: bool
value: false
mirror: always
# Toggle which thread the HTML5 parser uses for stream parsing.
- name: html5.offmainthread
type: bool
value: true
mirror: always
# 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
# Whether we attempt to downscale images during decoding.
- name: image.downscale-during-decode.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# Whether to honor orientation metadata (such as JPEG EXIF tags) by default.
# When this pref is enabled, all images used by the platform will be correctly
# re-oriented, except for content images (HTML <img> and CSS generated content
# images) with image-orientation:none.
- name: image.honor-orientation-metadata
type: RelaxedAtomicBool
value: true
mirror: always
# Honor image orientation metadata in the naturalWidth and naturalHeight
# APIs on HTMLImageElement.
- name: image.honor_orientation_metadata.natural_size
type: bool
value: true
mirror: always
# The threshold for inferring that changes to an <img> 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
# Whether the heap should be used for frames from animated images. On Android,
# volatile memory keeps file handles open for each buffer.
- name: image.mem.animated.use_heap
type: RelaxedAtomicBool
value: @IS_ANDROID@
mirror: always
# Enable extra information for debugging in the image memory reports.
- name: image.mem.debug-reporting
type: RelaxedAtomicBool
value: false
mirror: always
# Decodes images into shared memory to allow direct use in separate
# rendering processes. Only applicable with WebRender.
- name: image.mem.shared
type: RelaxedAtomicBool
value: true
mirror: always
# 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
# Minimum buffer size in KB before using volatile memory over the heap.
- name: image.mem.volatile.min_threshold_kb
type: RelaxedAtomicInt32
#if defined(ANDROID)
# On Android, volatile memory keeps file handles open for each buffer.
value: 100
#else
value: -1
#endif
mirror: always
# How long in ms before we should start shutting down idle decoder threads.
- name: image.multithreaded_decoding.idle_timeout
type: int32_t
value: 600000
mirror: once
# How many threads we'll use for multithreaded decoding. If < 0, will be
# automatically determined based on the system's number of cores.
- name: image.multithreaded_decoding.limit
type: int32_t
value: -1
mirror: once
# Whether we attempt to decode WebP images or not.
- name: image.webp.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# Whether we attempt to decode AVIF images or not.
- name: image.avif.enabled
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
#---------------------------------------------------------------------------
# Prefs starting with "intl."
#---------------------------------------------------------------------------
# Whether the new encoding detector is enabled for the .jp TLD.
- name: intl.charset.detector.ng.jp.enabled
type: bool
value: false
mirror: always
# Whether the new encoding detector is enabled for the .in TLD.
- name: intl.charset.detector.ng.in.enabled
type: bool
value: false
mirror: always
# Whether the new encoding detector is enabled for the .lk TLD.
- name: intl.charset.detector.ng.lk.enabled
type: bool
value: false
mirror: always
# If true, dispatch the keydown and keyup events on any web apps even during
# composition.
- name: intl.ime.hack.on_any_apps.fire_key_events_for_composition
type: bool
value: @IS_ANDROID@
mirror: always
# Android-specific pref to control if keydown and keyup events are fired even
# during composition. Note that those prefs are ignored if
# dom.keyboardevent.dispatch_during_composition is false.
- name: intl.ime.hack.on_ime_unaware_apps.fire_key_events_for_composition
type: bool
# If true and intl.ime.hack.on_any_apps.fire_key_events_for_composition is
# false, dispatch the keydown and keyup events only on IME-unaware web apps.
# So, this supports web apps which listen to only keydown or keyup events
# to get a change to do something at every text input.
value: @IS_ANDROID@
mirror: always
#ifdef XP_WIN
# 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
#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
#---------------------------------------------------------------------------
# Prefs starting with "javascript."
#---------------------------------------------------------------------------
- name: javascript.options.compact_on_user_inactive
type: bool
value: true
mirror: always
# 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 better error message when accessing property of null or undefined.
- name: javascript.options.property_error_message_fix
type: RelaxedAtomicBool
value: @IS_NIGHTLY_OR_DEV_EDITION@
mirror: always
# Support for weak references in JavaScript (WeakRef and FinalizationRegistry).
- name: javascript.options.weakrefs
type: RelaxedAtomicBool
value: true
mirror: always
# Whether to expose the FinalizationRegistry.prototype.cleanupSome method.
- name: javascript.options.experimental.weakrefs.expose_cleanupSome
type: RelaxedAtomicBool
value: false
mirror: always
#ifdef NIGHTLY_BUILD
# Experimental support for Iterator Helpers in JavaScript.
- name: javascript.options.experimental.iterator_helpers
type: RelaxedAtomicBool
value: false
mirror: always
# Experimental support for Private Fields in JavaScript.
- name: javascript.options.experimental.private_fields
type: RelaxedAtomicBool
value: false
mirror: always
# Experimental support for Private Methods in JavaScript.
- name: javascript.options.experimental.private_methods
type: RelaxedAtomicBool
value: false
mirror: always
# Experimental support for Top-level Await in JavaScript.
- name: javascript.options.experimental.top_level_await
type: RelaxedAtomicBool
value: false
mirror: always
#endif
# 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: 100
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, since we do one in the
# mobile browser (bug 669346).
# XXX: this value possibly should be changed, or the pref removed entirely.
# See bug 1450787.
value: @IS_NOT_ANDROID@
mirror: always
- name: javascript.options.mem.log
type: bool
value: false
mirror: always
- name: javascript.options.mem.notify
type: bool
value: false
mirror: always
# Streams API.
- name: javascript.options.streams
type: RelaxedAtomicBool
value: true
mirror: always
# Writable Streams API. (The pref above must also be set to expose this.)
#
# Writable streams are still EXTRAORDINARILY BETA and it is well-known that
# things are likely pretty broken if you poke much at all, so if you flip this
# preference, don't report bugs against it just yet.
- name: javascript.options.writable_streams
type: RelaxedAtomicBool
value: false
mirror: always
- 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_optimizingjit
type: bool
#if defined(MOZ_AARCH64) && !defined(ENABLE_WASM_CRANELIFT)
value: false
#else
value: true
#endif
mirror: always
#if defined(ENABLE_WASM_SIMD)
- name: javascript.options.wasm_simd
type: bool
#if defined(NIGHTLY_BUILD)
value: true
#else
value: false
#endif
mirror: always
#endif
#if defined(ENABLE_WASM_SIMD_WORMHOLE) && defined(EARLY_BETA_OR_EARLIER)
# This is x64-only and it would break unified macOS builds if
# it were in all.js. The feature rides the trains but not the
# pref to control it; in late beta and release, it is only
# available to privileged content.
- name: javascript.options.wasm_simd_wormhole
type: bool
value: false
mirror: always
#endif
- name: javascript.options.large_arraybuffers
type: RelaxedAtomicBool
value: false
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).
- name: layers.acceleration.draw-fps
type: RelaxedAtomicBool
value: false
mirror: always
- name: layers.acceleration.draw-fps.print-histogram
type: RelaxedAtomicBool
value: false
mirror: always
- name: layers.acceleration.draw-fps.write-to-file
type: RelaxedAtomicBool
value: false
mirror: always
# Whether to force acceleration on, ignoring blacklists.
# bug 838603 -- on Android, accidentally blacklisting OpenGL layers
# means a startup crash for everyone.
# Temporarily force-enable GL compositing. This is default-disabled
# deep within the bowels of the widgetry system. Remove me when GL
# compositing isn't default disabled in widget/android.
- name: layers.acceleration.force-enabled
type: bool
value: @IS_ANDROID@
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
# Preference that when switched at runtime will run a series of benchmarks
# and output the result to stderr.
- name: layers.bench.enabled
type: RelaxedAtomicBool
value: false
mirror: always
- name: layers.bufferrotation.enabled
type: bool
value: true
mirror: once
- name: layers.child-process-shutdown
type: RelaxedAtomicBool
value: true
mirror: always
- name: layers.componentalpha.enabled
type: bool
#ifdef MOZ_GFX_OPTIMIZE_MOBILE
# Nb: we ignore this pref if MOZ_GFX_OPTIMIZE_MOBILE is defined, as if this
# pref was always false. But we go to the effort of setting it to false so
# that telemetry's reporting of the pref value is more likely to reflect what
# the code is doing.
value: false
#else
value: true
#endif
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
- name: layers.draw-bigimage-borders
type: RelaxedAtomicBool
value: false
mirror: always
- name: layers.draw-borders
type: RelaxedAtomicBool
value: false
mirror: always
- name: layers.draw-tile-borders
type: RelaxedAtomicBool
value: false
mirror: always
- name: layers.draw-layer-info
type: RelaxedAtomicBool
value: false
mirror: always
- name: layers.dump
type: RelaxedAtomicBool
value: false
mirror: always
# If we're dumping layers, also dump the texture data
- name: layers.dump-texture
type: RelaxedAtomicBool
value: false
mirror: always
#ifdef MOZ_DUMP_PAINTING
- name: layers.dump-decision
type: RelaxedAtomicBool
value: false
mirror: always
#endif
- name: layers.dump-client-layers
type: RelaxedAtomicBool
value: false
mirror: always
- name: layers.dump-host-layers
type: RelaxedAtomicBool
value: false
mirror: always
- name: layers.compositing-tiles.width
type: RelaxedAtomicInt32
value: 1024
mirror: always
- name: layers.compositing-tiles.height
type: RelaxedAtomicInt32
value: 1024
mirror: always
# 0 is "no change" for contrast, positive values increase it, negative values
# decrease it until we hit mid gray at -1 contrast, after that it gets weird.
- name: layers.effect.contrast
type: AtomicFloat
value: 0.0f
mirror: always
- name: layers.effect.grayscale
type: RelaxedAtomicBool
value: false
mirror: always
- name: layers.effect.invert
type: RelaxedAtomicBool
value: false
mirror: always
- name: layers.enable-tiles
type: bool
#if defined(XP_MACOSX) || defined (XP_OPENBSD)
value: true
#else
value: false
#endif
mirror: once
- name: layers.enable-tiles-if-skia-pomtp
type: bool
#if defined(XP_WIN)
value: true
#else
value: false
#endif
mirror: once
- name: layers.flash-borders
type: RelaxedAtomicBool
value: false
mirror: always
# Force all possible layers to be always active layers.
- name: layers.force-active
type: bool
value: false
mirror: always
- name: layers.force-shmem-tiles
type: bool
value: false
mirror: once
- name: layers.draw-mask-debug
type: RelaxedAtomicBool
value: false
mirror: always
- name: layers.force-synchronous-resize
type: RelaxedAtomicBool
value: true
mirror: always
# Whether to enable arbitrary layer geometry for OpenGL compositor.
- name: layers.geometry.opengl.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# Whether to enable arbitrary layer geometry for Basic compositor.
- name: layers.geometry.basic.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# Whether to enable arbitrary layer geometry for DirectX compositor.
- name: layers.geometry.d3d11.enabled
type: RelaxedAtomicBool
value: true
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)
value: true
#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.max_restarts
type: RelaxedAtomicInt32
#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
#if defined(NIGHTLY_BUILD)
value: 3
#else
value: 1
#endif
#else
value: 1
#endif
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
- name: layers.low-precision-buffer
type: RelaxedAtomicBool
value: false
mirror: always
- name: layers.low-precision-opacity
type: AtomicFloat
value: 1.0f
mirror: always
- name: layers.low-precision-resolution
type: AtomicFloat
value: 0.25f
mirror: always
# Max number of layers per container. See Overwrite in mobile prefs.
- name: layers.max-active
type: RelaxedAtomicInt32
value: -1
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
- name: layers.omtp.capture-limit
type: uint32_t
value: 25 * 1024 * 1024
mirror: once
- name: layers.omtp.dump-capture
type: RelaxedAtomicBool
value: false
mirror: always
- name: layers.omtp.paint-workers
type: int32_t
value: -1
mirror: once
- name: layers.omtp.release-capture-on-main-thread
type: RelaxedAtomicBool
value: false
mirror: always
- name: layers.orientation.sync.timeout
type: RelaxedAtomicUint32
value: (uint32_t)0
mirror: always
#ifdef XP_WIN
- name: layers.prefer-opengl
type: bool
value: false
mirror: once
#endif
- name: layers.progressive-paint
type: RelaxedAtomicBool
value: false
mirror: always
# Copy-on-write canvas.
- name: layers.shared-buffer-provider.enabled
type: RelaxedAtomicBool
value: true
mirror: always
- name: layers.single-tile.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# We allow for configurable and rectangular tile size to avoid wasting memory
# on devices whose screen size does not align nicely to the default tile size.
# Although layers can be any size, they are often the same size as the screen,
# especially for width.
- name: layers.tile-width
type: int32_t
value: 512
mirror: once
- name: layers.tile-height
type: int32_t
value: 512
mirror: once
- name: layers.tile-initial-pool-size
type: uint32_t
value: (uint32_t)50
mirror: once
- name: layers.tile-pool-unused-size
type: uint32_t
value: (uint32_t)10
mirror: once
- name: layers.tile-pool-shrink-timeout
type: uint32_t
value: (uint32_t)50
mirror: once
- name: layers.tile-pool-clear-timeout
type: uint32_t
value: (uint32_t)5000
mirror: once
# If this is set the tile size will only be treated as a suggestion.
# On B2G we will round this to the stride of the underlying allocation.
# On any platform we may later use the screen size and ignore
# tile-width/tile-height entirely. Its recommended to turn this off
# if you change the tile size.
- name: layers.tiles.adjust
type: bool
value: true
mirror: once
- name: layers.tiles.edge-padding
type: bool
value: @IS_ANDROID@
mirror: once
- name: layers.tiles.fade-in.enabled
type: RelaxedAtomicBool
value: false
mirror: always
- name: layers.tiles.fade-in.duration-ms
type: RelaxedAtomicUint32
value: 250
mirror: always
- name: layers.tiles.retain-back-buffer
type: RelaxedAtomicBool
value: true
mirror: always
- name: layers.transaction.warning-ms
type: RelaxedAtomicUint32
value: 200
mirror: always
- name: layers.uniformity-info
type: bool
value: false
mirror: once
- name: layers.use-image-offscreen-surfaces
type: bool
value: true
mirror: once
- 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
# Whether we should layerize all animated images (if otherwise possible).
- name: layout.animated-image-layers.enabled
type: bool
value: false
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: @IS_NIGHTLY_BUILD@
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 non-standard caption-side values are enabled
- name: layout.css.caption-side-non-standard.enabled
type: RelaxedAtomicBool
value: false
mirror: always
rust: true
# Whether Constructable Stylesheets are enabled in script.
- name: layout.css.constructable-stylesheets.enabled
type: bool
value: false
mirror: always
# Should we look for counter ancestor scopes first?
- name: layout.css.counter-ancestor-scope.enabled
type: bool
value: true
mirror: always
# Whether we get notified of history queries for visited even if unvisited.
- name: layout.css.notify-of-unvisited
type: RelaxedAtomicBool
value: true
mirror: always
# Whether we always restyle / repaint as a result of a visited query
- name: layout.css.always-repaint-on-unvisited
type: RelaxedAtomicBool
value: true
mirror: always
# Make `zoom` a `transform` + `transform-origin` alias.
- name: layout.css.zoom-transform-hack.enabled
type: RelaxedAtomicBool
value: false
mirror: always
rust: true
# Whether the `no-preference` value for `prefers-color-scheme` is parsed.
#
# It never matches regardless.
- name: layout.css.prefers-color-scheme-no-preference.enabled
type: RelaxedAtomicBool
value: false
mirror: always
rust: true
# Whether the `:autofill` pseudo-class is exposed to content.
- name: layout.css.autofill.enabled
type: RelaxedAtomicBool
value: true
mirror: always
rust: true
# Whether the `:-moz-submit-invalid` pseudo-class is exposed to content.
- name: layout.css.moz-submit-invalid.enabled
type: RelaxedAtomicBool
value: false
mirror: always
rust: true
# Whether the `aspect-ratio` in css-sizing-4 is enabled.
- name: layout.css.aspect-ratio.enabled
type: bool
value: @IS_NIGHTLY_BUILD@
mirror: always
rust: true
# Is the codepath for using cached scrollbar styles enabled?
- name: layout.css.cached-scrollbar-styles.enabled
type: bool
value: true
mirror: always
# Is path() supported in clip-path?
- name: layout.css.clip-path-path.enabled
type: RelaxedAtomicBool
value: true
mirror: always
rust: true
# Is the image-set() function enabled?
- name: layout.css.image-set.enabled
type: RelaxedAtomicBool
value: @IS_NIGHTLY_BUILD@
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
# 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). A positive value is used as-is. This effectively controls the size
# of a CSS "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: false
mirror: always
# 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
# 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 DOMMatrix enabled?
- name: layout.css.DOMMatrix.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# Is support for DOMQuad enabled?
- name: layout.css.DOMQuad.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# Is support for DOMPoint enabled?
- name: layout.css.DOMPoint.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# Are we emulating -moz-{inline}-box layout using CSS flexbox?
- name: layout.css.emulate-moz-box-with-flex
type: bool
value: false
mirror: always
# Is support for the font-display @font-face descriptor enabled?
- name: layout.css.font-display.enabled
type: RelaxedAtomicBool
value: true
mirror: always
rust: true
# Is support for document.fonts enabled?
- name: layout.css.font-loading-api.enabled
type: bool
value: true
mirror: always
# Is support for variation fonts enabled?
- name: layout.css.font-variations.enabled
type: RelaxedAtomicBool
value: true
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.level
type: RelaxedAtomicInt32
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 CSS "grid-template-{columns,rows}: subgrid X" enabled?
- name: layout.css.grid-template-subgrid-value.enabled
type: RelaxedAtomicBool
value: true
mirror: always
rust: true
# 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 CSS individual transform enabled?
- name: layout.css.individual-transform.enabled
type: bool
value: true
mirror: always
# Is the initial value for the image-orientation property 'from-image'?
- name: layout.css.image-orientation.initial-from-image
type: RelaxedAtomicBool
value: true
mirror: always
rust: true
# Is support for CSS initial-letter property enabled?
- name: layout.css.initial-letter.enabled
type: bool
value: false
mirror: always
# Pref to control whether line-height: -moz-block-height is exposed to content.
- name: layout.css.line-height-moz-block-height.content.enabled
type: RelaxedAtomicBool
value: false
mirror: always
rust: true
# Is support for motion-path enabled?
- name: layout.css.motion-path.enabled
type: bool
value: true
mirror: always
# Is support for motion-path ray() enabled?
- name: layout.css.motion-path-ray.enabled
type: RelaxedAtomicBool
value: @IS_NIGHTLY_BUILD@
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 support for math-style enabled?
- name: layout.css.math-style.enabled
type: RelaxedAtomicBool
value: @IS_NIGHTLY_BUILD@
mirror: always
rust: true
# Is support for math-depth enabled?
# This must not be enabled until implementation is complete (see bug 1667090).
- name: layout.css.math-depth.enabled
type: RelaxedAtomicBool
value: false
mirror: always
rust: true
# Pref to control whether @-moz-document rules are enabled in content pages.
- name: layout.css.moz-document.content.enabled
type: RelaxedAtomicBool
value: false
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 overscroll-behavior enabled?
- name: layout.css.overscroll-behavior.enabled
type: bool
value: true
mirror: always
- name: layout.css.overflow-logical.enabled
type: bool
value: true
mirror: always
# Dictates whether or not the prefers contrast media query will be
# usable.
# true: prefers-contrast will toggle based on OS and browser settings.
# false: prefers-contrast will only parse and toggle in the browser
# chrome and ua.
- name: layout.css.prefers-contrast.enabled
type: RelaxedAtomicBool
value: false
mirror: always
rust: true
# Dictates whether or not the forced-colors media query is enabled.
- name: layout.css.forced-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 multi-column properties (including column-gap) enabled?
- name: layout.css.prefixes.columns
type: bool
value: false
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: true
mirror: always
# Is CSS error reporting enabled?
- name: layout.css.report_errors
type: bool
value: true
mirror: always
- name: layout.css.resizeobserver.enabled
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
- name: layout.css.supports-selector.enabled
type: RelaxedAtomicBool
value: true
mirror: always
rust: true
# Is CSSOM-View scroll-behavior and its MSD smooth scrolling enabled?
- name: layout.css.scroll-behavior.enabled
type: RelaxedAtomicBool
value: true
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
# 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
# Set the threshold distance in CSS pixels below which scrolling will snap to
# an edge, when scroll snapping is set to "proximity".
- name: layout.css.scroll-snap.proximity-threshold
type: RelaxedAtomicInt32
value: 200
mirror: always
# Is steps(jump-*) supported in easing functions?
- name: layout.css.step-position-jump.enabled
type: RelaxedAtomicBool
value: true
mirror: always
rust: true
# W3C touch-action css property (related to touch and pointer events)
# Note that we turn this on even on platforms/configurations where touch
# events are not supported (e.g. OS X, or Windows with e10s disabled). For
# those platforms we don't handle touch events anyway so it's conceptually
# a no-op.
- name: layout.css.touch_action.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# 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
- name: layout.css.xul-display-values.content.enabled
type: RelaxedAtomicBool
value: false
mirror: always
rust: true
# Pref to control whether display: -moz-box and display: -moz-inline-box are
# parsed in content pages.
- name: layout.css.xul-box-display-values.content.enabled
type: RelaxedAtomicBool
value: false
mirror: always
rust: true
# Whether to block large cursors intersecting UI.
- name: layout.cursor.block.enabled
type: bool
value: true
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.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
# 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.flatten-transform
type: RelaxedAtomicBool
value: true
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 <input type=search> 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
# 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
# The time in number of frames that we estimate for a refresh driver
# to be quiescent.
- 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
# 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
- name: layout.min-active-layer-size
type: int32_t
value: 64
mirror: always
- name: layout.paint_rects_separately
type: bool
value: true
mirror: once
# 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 is to be set by test code only.
- name: layout.scrollbars.always-layerize-track
type: RelaxedAtomicBool
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
- name: layout.smaller-painted-layers
type: RelaxedAtomicBool
value: false
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
- name: layout.lower_priority_refresh_driver_during_load
type: bool
value: true
mirror: always
# Is layout of CSS outline-style:auto enabled?
- name: layout.css.outline-style-auto.enabled
type: bool
value: true
mirror: always
# Whether outline should follow the border radius.
- name: layout.css.outline-follows-border-radius.enabled
type: bool
value: true
mirror: always
# Pref to control enabling scroll anchoring.
- name: layout.css.scroll-anchoring.enabled
type: bool
value: true
mirror: always
# Pref to control how many consecutive scroll-anchoring adjustments (since the
# most recent user scroll) 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
# 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: 3
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
# Are shared memory User Agent style sheets enabled?
- name: layout.css.shared-memory-ua-sheets.enabled
type: bool
value: true
mirror: always
# Is support for -webkit-line-clamp enabled?
- name: layout.css.webkit-line-clamp.enabled
type: bool
value: true
mirror: always
# Whether the computed value of line-height: normal returns the `normal`
# keyword rather than a pixel value based on the first available font.
#
# Only enabled on Nightly and early beta, at least for now.
#
# It'd be nice to make numbers compute also to themselves, but it looks like
# everybody agrees on turning them into pixels, see the discussion starting
# from [1].
#
# [1]: https://github.com/w3c/csswg-drafts/issues/3749#issuecomment-477287453
- name: layout.css.line-height.normal-as-resolved-value.enabled
type: bool
value: true
mirror: always
# Are the width and height attributes on image-like elements mapped to the
# internal-for-now aspect-ratio property?
- name: layout.css.width-and-height-map-to-aspect-ratio.enabled
type: bool
value: true
mirror: always
# Whether :is() and :where() ignore errors inside their selector lists
# internally, rather than failing to parse altogether.
#
# See https://github.com/w3c/csswg-drafts/issues/3264
- name: layout.css.is-and-where-better-error-recovery.enabled
type: RelaxedAtomicBool
value: true
mirror: always
rust: true
# 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
# 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: bool
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
#---------------------------------------------------------------------------
# Prefs starting with "mathml."
#---------------------------------------------------------------------------
# Whether to disable deprecated style attributes background, color, fontfamily,
# fontsize, fontstyle and fontweight.
- name: mathml.deprecated_style_attributes.disabled
type: bool
value: true
mirror: always
# Whether to disable deprecated "radical" notation for the menclose element.
- name: mathml.deprecated_menclose_notation_radical.disabled
type: bool
value: true
mirror: always
# Whether to disable legacy names "small", "normal" and "big" for the
# mathsize attribute.
- name: mathml.mathsize_names.disabled
type: bool
value: true
mirror: always
# 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 the mfrac bevelled attribute.
- name: mathml.mfrac_bevelled_attribute.disabled
type: bool
value: true
mirror: always
# Whether to disable legacy names "thin", "thick" and "medium" for the
# linethickness attribute of the mfrac element.
- name: mathml.mfrac_linethickness_names.disabled
type: bool
value: true
mirror: always
# Whether to disable deprecated numalign/denomalign/align attributes
- name: mathml.deprecated_alignment_attributes.disabled
type: bool
value: true
mirror: always
# Whether to disable subscriptshift and superscriptshift attributes.
- name: mathml.script_shift_attributes.disabled
type: bool
value: true
mirror: always
# Whether to disable the scriptminsize attribute.
# Note that this only disables parsing, not the default effect when no attribute
# is unspecified.
- name: mathml.scriptminsize_attribute.disabled
type: bool
value: @IS_NIGHTLY_BUILD@
mirror: always
# Whether to disable the scriptsizemultiplier attribute.
- name: mathml.scriptsizemultiplier_attribute.disabled
type: bool
value: @IS_NIGHTLY_BUILD@
mirror: always
# Whether to disable support for XLink on MathML elements.
- name: mathml.xlink.disabled
type: bool
value: true
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
#if defined(XP_MACOSX)
value: @IS_NIGHTLY_BUILD@
#else
value: true
#endif
mirror: always
#---------------------------------------------------------------------------
# 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
# 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
# Whether cubeb is sandboxed
- name: media.cubeb.sandbox
type: bool
mirror: always
#if defined(XP_LINUX) && !defined(MOZ_WIDGET_ANDROID)
value: true
#elif defined(XP_WIN) && !defined(_ARM64_)
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
# ClockDrift desired buffering in milliseconds
- name: media.clockdrift.buffering
type: int32_t
mirror: always
value: 50
# 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
- name: media.mediasource.webm.audio.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# Whether to enable MediaSource v2 support.
- name: media.mediasource.experimental.enabled
type: RelaxedAtomicBool
value: false
mirror: always
# VideoSink
- 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://github.com/WICG/encrypted-media-encryption-scheme/blob/master/explainer.md
# 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: false
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: false
mirror: always
- name: media.clearkey.persistent-license.enabled
type: bool
value: false
mirror: always
- name: media.cloneElementVisually.testing
type: bool
value: false
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
#ifdef XP_MACOSX
# These prefs control whether or not a universal build running on
# an Apple Silicon machine will attempt to use an x64 Widevine or
# OpenH264 plugin. This requires launching the GMP child process
# executable in x64 mode. We expect to allow this for Widevine until
# an arm64 version of Widevine is made available. We don't expect
# to need to allow this for OpenH264.
#
# Allow a Widevine GMP x64 process to be executed on ARM builds.
- name: media.gmp-widevinecdm.allow-x64-plugin-on-arm64
type: RelaxedAtomicBool
value: true
mirror: always
# Don't allow an OpenH264 GMP x64 process to be executed on ARM builds.
- name: media.gmp-gmpopenh264.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.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
#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
#ifdef MOZ_FFMPEG
- name: media.rdd-ffmpeg.enabled
type: RelaxedAtomicBool
value: false
mirror: always
#endif
#ifdef MOZ_FFVPX
- 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
#else
value: false
#endif
mirror: always
#endif
#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-theora.enabled
type: RelaxedAtomicBool
#if defined(XP_WIN)
value: true
#elif defined(XP_MACOSX)
value: true
#elif defined(XP_LINUX) && !defined(ANDROID)
value: true
#else
value: false
#endif
mirror: always
- 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
#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
#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
#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
#else
value: false
#endif
mirror: always
- name: media.rdd-webaudio.batch.size
type: RelaxedAtomicInt32
value: 100
mirror: always
#ifdef ANDROID
# Enable the MediaCodec PlatformDecoderModule by default.
- name: media.android-media-codec.enabled
type: RelaxedAtomicBool
value: true
mirror: always
- name: media.android-media-codec.preferred
type: RelaxedAtomicBool
value: true
mirror: always
#endif # ANDROID
#ifdef MOZ_OMX
- name: media.omx.enabled
type: bool
value: false
mirror: always
#endif
#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
#ifdef MOZ_WAYLAND
# Disable DMABuf for ffmpeg video textures on Linux
- name: media.ffmpeg.dmabuf-textures.disabled
type: RelaxedAtomicBool
value: false
mirror: always
# Use VA-API for ffmpeg video playback on Linux
- name: media.ffmpeg.vaapi.enabled
type: RelaxedAtomicBool
value: false
mirror: always
# Use DRM display for VA-API ffmpeg video decoding on Linux
- name: media.ffmpeg.vaapi-drm-display.enabled
type: RelaxedAtomicBool
value: true
mirror: always
#endif # MOZ_WAYLAND
#endif # MOZ_FFMPEG
- name: media.ffvpx.enabled
type: RelaxedAtomicBool
#ifdef MOZ_FFVPX
value: true
#else
value: false
#endif
mirror: always
- name: media.ffvpx.mp3.enabled
type: RelaxedAtomicBool
#ifdef MOZ_FFVPX
value: true
#else
value: false
#endif
mirror: always
# 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: bool
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.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: false
mirror: always
- name: media.wmf.low-latency.force-disabled
type: RelaxedAtomicBool
value: false
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: false
mirror: always
- name: media.wmf.vp9.enabled
type: bool
value: true
mirror: once
#endif # MOZ_WMF
- 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
- name: media.gmp.decoder.enabled
type: RelaxedAtomicBool
value: false
mirror: always
# Whether to suspend decoding of videos in background tabs.
- name: media.suspend-bkgnd-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-bkgnd-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
# TextTrack WebVTT Region extension support.
- name: media.webvtt.regions.enabled
type: bool
value: true
mirror: always
# This pref controls whether dispatch testing-only events.
- name: media.webvtt.testing.events
type: bool
value: true
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: false
mirror: always
#endif # MOZ_WEBSPEECH
- name: media.encoder.webm.enabled
type: RelaxedAtomicBool
#if defined(MOZ_WEBM_ENCODER)
value: true
#else
value: false
#endif
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
# 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
#if defined(XP_WIN) && !defined(_ARM64_)
value: true
#elif defined(XP_MACOSX)
value: true
#elif defined(MOZ_WIDGET_ANDROID)
value: @IS_EARLY_BETA_OR_EARLIER@
#elif defined(XP_UNIX)
value: true
#else
value: false
#endif
mirror: always
- name: media.av1.use-dav1d
type: RelaxedAtomicBool
#if defined(XP_WIN) && !defined(_ARM64_)
value: true
#elif defined(XP_MACOSX)
value: true
#elif defined(XP_UNIX)
value: true
#else
value: false
#endif
mirror: always
- name: media.flac.enabled
type: bool
value: true
mirror: always
# Hls
- name: media.hls.enabled
type: RelaxedAtomicBool
value: @IS_ANDROID@
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
#ifdef MOZ_FMP4
value: true
#else
value: false
#endif
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-bkgnd-video-on-tabhover
type: bool
value: true
mirror: always
- name: media.videocontrols.lock-video-orientation
type: bool
value: @IS_ANDROID@
mirror: always
# Media Seamless Looping
- name: media.seamless-looping
type: RelaxedAtomicBool
value: true
mirror: always
- name: media.autoplay.block-event.enabled
type: bool
value: false
mirror: always
- name: media.media-capabilities.enabled
type: RelaxedAtomicBool
value: true
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
# 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 [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
# 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
# WebRTC prefs follow
# 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: bool
value: true
mirror: always
- name: media.peerconnection.dtmf.enabled
type: bool
value: true
mirror: always
- name: media.peerconnection.identity.enabled
type: bool
value: true
mirror: always
- name: media.peerconnection.rtpsourcesapi.enabled
type: bool
value: true
mirror: always
#ifdef MOZ_WEBRTC
#ifdef ANDROID
- name: media.navigator.hardware.vp8_encode.acceleration_remote_enabled
type: bool
value: true
mirror: always
- name: media.navigator.hardware.vp8_encode.acceleration_enabled
type: bool
value: true
mirror: never
- name: media.navigator.hardware.vp8_decode.acceleration_enabled
type: bool
value: false
mirror: never
#endif # ANDROID
# 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)
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
#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: true
mirror: always
# setSinkId will be enabled in bug 1498512. Till then the
# implementation will remain hidden behind this pref (Bug 1152401, Bug 934425).
- name: media.setsinkid.enabled
type: bool
value: false
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: false
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.
- name: media.mediacontrol.stopcontrol.timer.ms
type: RelaxedAtomicUint32
value: 60000
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
- name: media.webrtc.platformencoder
type: bool
#if defined(MOZ_WIDGET_ANDROID)
value: true
#else
value: false
#endif
mirror: always
- 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
# 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
#---------------------------------------------------------------------------
# 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
# <html> element) is typically not considered as a root element, but the <body>
# element is typically considered as a root element. If there is no <body>
# element, then consider the <html> element instead.
- name: mousewheel.autodir.honourroot
type: bool
value: false
mirror: always
- name: mousewheel.system_scroll_override_on_root_content.enabled
type: RelaxedAtomicBool
#ifdef XP_WIN
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_on_root_content.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_on_root_content.enabled" is
# true, when Gecko detects the user customized the system scrolling speed
# settings, the override isn't executed.
- name: mousewheel.system_scroll_override_on_root_content.horizontal.factor
type: RelaxedAtomicInt32
value: 200
mirror: always
- name: mousewheel.system_scroll_override_on_root_content.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
#---------------------------------------------------------------------------
# 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: true
mirror: always
# See the full list of values in nsICookieService.idl.
- name: network.cookie.cookieBehavior
type: RelaxedAtomicInt32
value: 0 # accept all cookies
mirror: always
# See the full list of values in nsICookieService.idl.
- name: network.cookie.rejectForeignWithExceptions.enabled
type: bool
value: false
mirror: always
# Stale threshold for cookies in seconds.
- name: network.cookie.staleThreshold
type: uint32_t
value: 60
mirror: always
# Cookie lifetime policy. Possible values:
# 0 - accept all cookies
# 1 - deprecated. don't use it.
# 2 - accept as session cookies
# 3 - deprecated. don't use it.
- name: network.cookie.lifetimePolicy
type: RelaxedAtomicInt32
value: 0
mirror: always
- name: network.cookie.sameSite.laxByDefault
type: bool
value: @IS_NIGHTLY_BUILD@
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
- name: network.cookie.sameSite.noneRequiresSecure
type: bool
value: @IS_NIGHTLY_BUILD@
mirror: always
- name: network.cookie.sameSite.schemeful
type: bool
value: @IS_NIGHTLY_BUILD@
mirror: always
- name: network.cookie.thirdparty.sessionOnly
type: bool
value: false
mirror: always
- name: network.cookie.thirdparty.nonsecureSessionOnly
type: bool
value: false
mirror: always
- name: network.data.max-uri-length-mobile
type: RelaxedAtomicUint32
value: 2 * 1024 * 1024
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
# 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: false
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
# 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
# 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 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
# If set to true, IOService.offline depends on IOService.connectivity.
- name: network.offline-mirrors-connectivity
type: RelaxedAtomicBool
value: false
mirror: always
# Enables the predictive service.
- name: network.predictor.enabled
type: bool
value: true
mirror: always
# Set true to allow resolving proxy for localhost
- name: network.proxy.allow_hijacking_localhost
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: false
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
# Enables `<link rel="preload">` tag and `Link: rel=preload` response header handling.
- name: network.preload
type: RelaxedAtomicBool
value: true
mirror: always
# Whether to use the network process or not
# Start a separate socket process. Performing networking on the socket process
# is control by a sepparate pref
# ("network.http.network_access_on_socket_process.enabled").
# Changing these prefs requires a restart.
- name: network.process.enabled
type: RelaxedAtomicBool
mirror: always
#if defined(ANDROID) || defined(MOZ_THUNDERBIRD)
value: false # see bug 1641427
#else
value: @IS_EARLY_BETA_OR_EARLIER@
#endif
# Whether we can send OnDataAvailable to content process directly.
- name: network.send_ODA_to_content_directly
type: RelaxedAtomicBool
value: false
mirror: always
# Perform all network access on the socket process.
# The pref requires "network.process.enabled" to be true.
# Changing these prefs requires a restart.
- name: network.http.network_access_on_socket_process.enabled
type: RelaxedAtomicBool
mirror: always
value: false
# Telemetry of traffic categories. Whether or not to enable HttpTrafficAnalyzer.
- name: network.traffic_analyzer.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# Whether DNS resolution is limited to literals and cached entries.
- name: network.dns.disabled
type: RelaxedAtomicBool
value: false
mirror: always
# Whether DNS resolution is limited to literals and cached entries.
- name: network.dns.skipTRR-when-parental-control-enabled
type: RelaxedAtomicBool
value: true
mirror: always
- name: network.dns.disablePrefetchFromHTTPS
type: bool
value: true
mirror: always
# Max time to shutdown the resolver threads
- name: network.dns.resolver_shutdown_timeout_ms
type: uint32_t
value: 2000
mirror: always
# When true on Windows DNS resolutions for single label domains
# (domains that don't contain a dot) will be resolved using the DnsQuery
# API instead of PR_GetAddrInfoByName
- name: network.dns.dns_query_single_label
type: RelaxedAtomicBool
value: false
mirror: always
# When this pref is true we enforce a 253 character limit on domains we try to
# resolve. See bug 1264117. If it doesn't cause any web-compat issues we can
# remove it in a few releases
- name: network.dns.limit_253_chars
type: RelaxedAtomicBool
value: true
mirror: always
# The proxy type. See nsIProtocolProxyService.idl
# PROXYCONFIG_DIRECT = 0
# PROXYCONFIG_MANUAL = 1
# PROXYCONFIG_PAC = 2
# PROXYCONFIG_WPAD = 4
# PROXYCONFIG_SYSTEM = 5
- name: network.proxy.type
type: RelaxedAtomicUint32
value: 5
mirror: always
# Whether the SOCKS proxy should be in charge of DNS resolution.
- name: network.proxy.socks_remote_dns
type: RelaxedAtomicBool
value: false
mirror: always
# When receiving a network change event, the time (in ms) we wait to reload the
# PAC url.
- name: network.proxy.reload_pac_delay
type: RelaxedAtomicUint32
value: 2000
mirror: always
# Some requests during a page load are marked as "tail", mainly trackers, but not only.
# This pref controls whether such requests are put to the tail, behind other requests
# emerging during page loading process.
- name: network.http.tailing.enabled
type: bool
value: true
mirror: always
# Whether to run proxy checks when processing Alt-Svc headers.
- name: network.http.altsvc.proxy_checks
type: bool
value: true
mirror: always
- name: network.http.stale_while_revalidate.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# Whether to cache SSL resumption tokens in necko.
- name: network.ssl_tokens_cache_enabled
type: RelaxedAtomicBool
value: @IS_NIGHTLY_BUILD@
mirror: always
# Capacity of the above cache, in kilobytes.
- name: network.ssl_tokens_cache_capacity
type: RelaxedAtomicUint32
value: 2048
mirror: always
# The maximum allowed length for a URL - 1MB default.
- name: network.standard-url.max-length
type: RelaxedAtomicUint32
value: 1048576
mirror: always
# Single TRR request timeout, in milliseconds
- name: network.trr.request_timeout_ms
type: RelaxedAtomicUint32
value: 1500
mirror: always
# Single TRR request timeout, in milliseconds for mode 3
- name: network.trr.request_timeout_mode_trronly_ms
type: RelaxedAtomicUint32
value: 30000
mirror: always
# The timeout of the TRR confirmation request
- name: network.trr.confirmation_timeout_ms
type: RelaxedAtomicUint32
value: 6000
mirror: always
# The timeout of the TRR confirmation request
- name: network.trr.confirmation_telemetry_enabled
type: RelaxedAtomicBool
value: true
mirror: always
# Whether to send the Accept-Language header for TRR requests
- name: network.trr.send_accept-language_headers
type: RelaxedAtomicBool
value: false
mirror: always
# Whether to send an empty Accept-Encoding header for TRR requests
- name: network.trr.send_empty_accept-encoding_headers
type: RelaxedAtomicBool
value: true
mirror: always
# Whether to send the User-Agent header for TRR requests
- name: network.trr.send_user-agent_headers
type: RelaxedAtomicBool
value: false
mirror: always
# This pref controls whether to use TRRServiceChannel off main thread.
- name: network.trr.fetch_off_main_thread
type: RelaxedAtomicBool
value: true
mirror: always
# If this pref is false, a task will be dispatched to remove the file from the
# disk and the pref will be set to true.
# It can probably be removed after a few releases.
- name: network.trr.blocklist_cleanup_done
type: RelaxedAtomicBool
value: false
mirror: always
# If we should wait for captive portal confirmation before enabling TRR
- name: network.trr.wait-for-portal
type: RelaxedAtomicBool
value: false
mirror: always
# If we should wait for TRR service confirmation to complete before enabling
# TRR for lookups when fallback is enabled. Confirmation is always skipped when
# global mode is TRR-only (no fallback).
- name: network.trr.wait-for-confirmation
type: RelaxedAtomicBool
value: false
mirror: always
# Use GET (rather than POST)
- name: network.trr.useGET
type: RelaxedAtomicBool
value: false
mirror: always
# Allow RFC1918 address in responses?
- name: network.trr.allow-rfc1918
type: RelaxedAtomicBool
value: false
mirror: always
# When true, it only sends AAAA when the system has IPv6 connectivity
- name: network.trr.skip-AAAA-when-not-supported
type: RelaxedAtomicBool
value: true
mirror: always
# Whether to apply split horizon mitigations when using TRR.
# These include adding the DNS suffix to the excluded domains
- name: network.trr.split_horizon_mitigations
type: RelaxedAtomicBool
value: true
mirror: always
# Explicitly disable ECS (EDNS Client Subnet, RFC 7871)
- name: network.trr.disable-ECS
type: RelaxedAtomicBool
value: true
mirror: always
# When true, the DNS+TRR cache will be cleared when a relevant TRR pref
# changes. (uri, bootstrapAddress, excluded-domains)
- name: network.trr.clear-cache-on-pref-change
type: RelaxedAtomicBool
value: true
mirror: always
# After this many failed TRR requests in a row, consider TRR borked
- name: network.trr.max-fails
type: RelaxedAtomicUint32
value: 15
mirror: always
# When the TRR confirmation is set to CONFIRM_FAILED due to many failures in
# a row, we set a timer to retry. This has an exponential backoff up to
# 64 seconds.
- name: network.trr.retry-timeout-ms
type: RelaxedAtomicUint32
value: 125
mirror: always
# Retry with no TRR when the response contained only 0.0.0.0 or ::
- name: network.trr.fallback-on-zero-response
type: RelaxedAtomicBool
value: false
mirror: always
# If true we parse the /etc/hosts file and exclude any host names from TRR.
# Reading the file is only done once, when TRR is first enabled - this could be
# soon after startup or when the pref is flipped.
- name: network.trr.exclude-etc-hosts
type: RelaxedAtomicBool
value: true
mirror: always
# Whether to enable odoh.
- name: network.trr.odoh.enabled
type: RelaxedAtomicBool
value: false
mirror: always
# The uri of Oblivious Proxy.
- name: network.trr.odoh.proxy_uri
type: String
value: ""
mirror: never
# The host name of Oblivious Target.
- name: network.trr.odoh.target_host
type: String
value: ""
mirror: never
# The uri path of the odoh uri.
- name: network.trr.odoh.target_path
type: String
value: ""
mirror: never
# The minimum ttl of the DNS record that contains ODoHConfigs.
- name: network.trr.odoh.min_ttl
type: RelaxedAtomicUint32
value: 60
mirror: always
# Allow the network changed event to get sent when a network topology or setup
# change is noticed while running.
- name: network.notify.changed
type: RelaxedAtomicBool
value: true
mirror: always
# Allow network detection of IPv6 related changes (bug 1245059)
- name: network.notify.IPv6
type: RelaxedAtomicBool
# ifdef XP_WIN
value: false
# else
value: true
# endif
mirror: always
# Whether to check the dnsSuffix on network changes
- name: network.notify.dnsSuffixList
type: RelaxedAtomicBool
value: true
mirror: always
# Whether to check the registry for proxies on network changes that indicate
# that TRR should not be used.
- name: network.notify.checkForProxies
type: RelaxedAtomicBool
value: true
mirror: always
# Whether to check the registry for NRPT rules on network changes that
# indicate that TRR should not be used.
- name: network.notify.checkForNRPT
type: RelaxedAtomicBool
value: true
mirror: always
# Whether NotifyIpInterfaceChange should be called immediately after
# registration in order to record the initial state of the network adapters.
- name: network.notify.initial_call
type: RelaxedAtomicBool
value: true
mirror: always
# Whether to use the rust implemented DefaultURI for unknown scheme types
- name: network.url.useDefaultURI
type: RelaxedAtomicBool
value: false
mirror: always
# Force remapping of remote port numbers to allow reaching local testing
# servers or port forwarders listening on non-standard ports. Note that
# this is not changing the origin URL in the addressbar, only internally
# the port number used. This is intended to be used along with the
# `network.dns.forceResolve` preference.
#
# The form is:
# "80,443,808-888=8080; 563=8081"
# this will remap ports for HTTP, HTTPS and the range of 808-888 included
# to use port 8080, and port 563 to go to 8081.
- name: network.socket.forcePort
type: String
value: ""
mirror: never
# Receive buffer size of QUIC socket
- name: network.http.http3.recvBufferSize
type: RelaxedAtomicInt32
value: 1048576
mirror: always
- name: network.http.http3.enable_qlog
type: RelaxedAtomicBool
value: false
mirror: always
# When a h3 transaction is inserted in the pending queue, the time (ms) we wait
# to create a TCP backup connection.
- name: network.http.http3.backup_timer_delay
type: RelaxedAtomicUint32
value: 100
mirror: always
# When true, a http request will be upgraded to https when HTTPS RR is
# available.
- name: network.dns.upgrade_with_https_rr
type: RelaxedAtomicBool
value: @IS_NIGHTLY_BUILD@
mirror: always
# Whether to use HTTPS RR as AltSvc
- name: network.dns.use_https_rr_as_altsvc
type: RelaxedAtomicBool
value: false
mirror: always
# Whether to check for NAT64 using the system resolver
- name: network.connectivity-service.nat64-check
type: bool
value: true
mirror: always
# Manually enter the NAT64 prefix that will be used if IPv4 is unavailable.
# The value is formatted as IPv6 with the least significant bits to be dropped.
# For example, 64:ff9b:: is a common prefix. This will not disable
# the NAT64 check, although the value of this pref will be prioritized.
- name: network.connectivity-service.nat64-prefix
type: String
value: ""
mirror: never
# Whether to enable echconfig.
- name: network.dns.echconfig.enabled
type: RelaxedAtomicBool
value: false
mirror: always
# This pref needs to be worked together with network.dns.echconfig.enabled
# being true and there is no record without ECHConfig.
# When we try all records with ECHConfig in HTTPS RRs and still can't connect,
# this pref indicate whether we can fallback to the origin server.
- name: network.dns.echconfig.fallback_to_origin_when_all_failed
type: RelaxedAtomicBool
value: true
mirror: always
# When true, reset the exclusion list when all records are excluded.
- name: network.dns.httpssvc.reset_exclustion_list
type: RelaxedAtomicBool
value: true
mirror: always
# If the http3 connection cannot be ready after the timeout value here, the
# transaction will start another non-http3 conneciton.
# Setting this value to 0 indicates this feature is disabled.
- name: network.dns.httpssvc.http3_fast_fallback_timeout
type: RelaxedAtomicUint32
value: 50
mirror: always
# Whether to use https rr for speculative connections.
- name: network.dns.use_https_rr_for_speculative_connection
type: RelaxedAtomicBool
value: false
mirror: always
- name: network.cache.frecency_array_check_enabled
type: RelaxedAtomicBool
value: @IS_EARLY_BETA_OR_EARLIER@
mirror: always
# This is used for a temporary workaround for a web-compat issue. If pref is
# true CORS preflight requests are allowed to send client certificates.
- name: network.cors_preflight.allow_client_cert
type: RelaxedAtomicBool
value: false
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "nglayout."
#---------------------------------------------------------------------------
# Enable/disable display list invalidation logging --- useful for debugging.
- name: nglayout.debug.invalidation
type: bool
value: false
mirror: always
# Enable/disable widget update area flashing --- only supported with
# BasicLayers (other layer managers always update the entire widget area).
- name: nglayout.debug.widget_update_flashing
type: RelaxedAtomicBool
value: false
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "page_load."
#---------------------------------------------------------------------------
# Time in milliseconds during which certain tasks are deprioritized during
# page load.
- name: page_load.deprioritization_period
type: RelaxedAtomicUint32
value: 5000
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "permissions."
#---------------------------------------------------------------------------
# 1-Accept, 2-Deny, Any other value: Accept
- name: permissions.default.image
type: RelaxedAtomicUint32
value: 1
mirror: always
- name: permissions.delegation.enabled
type: bool
value: true
mirror: always
- name: permissions.isolateBy.userContext
type: RelaxedAtomicBool
value: false
mirror: always
- name: permissions.isolateBy.privateBrowsing
type: RelaxedAtomicBool
value: @IS_EARLY_BETA_OR_EARLIER@
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "plain_text."
#---------------------------------------------------------------------------
# When false, text in plaintext documents does not wrap long lines.
- name: plain_text.wrap_long_lines
type: bool
value: true
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "plugin."
#---------------------------------------------------------------------------
# Whether sending WM_MOUSEWHEEL and WM_MOUSEHWHEEL to plugins on Windows.
- name: plugin.mousewheel.enabled
type: bool
value: true
mirror: always
- name: plugin.state.flash
type: uint32_t
# Flash is Click-to-Activate by default on all channels. Disabled for ARM builds.
#if defined(_ARM64_) && defined(XP_WIN)
value: 0
#else
value: 1
#endif
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "plugins."
#---------------------------------------------------------------------------
- name: plugins.flashBlock.enabled
type: bool
value: false
mirror: always
- name: plugins.http_https_only
type: bool
value: true
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "preferences."
#---------------------------------------------------------------------------
- name: preferences.allow.omt-write
type: bool
value: true
mirror: never
#ifdef DEBUG
# If set to true, setting a Preference matched to a `Once` StaticPref will
# assert that the value matches. Such assertion being broken is a clear flag
# that the Once policy shouldn't be used.
- name: preferences.check.once.policy
type: bool
value: false
mirror: always
# If set to true, StaticPrefs Once policy check will be skipped during
# automation regression test. Use with care. This pref must be set back to
# false as soon as specific test has completed.
- name: preferences.force-disable.check.once.policy
type: bool
value: false
mirror: always
#endif
#---------------------------------------------------------------------------
# Prefs starting with "print."
#---------------------------------------------------------------------------
# Variation fonts can't always be embedded in certain output formats
# such as PDF. To work around this, draw the variation fonts using
# paths instead of using font embedding.
- name: print.font-variations-as-paths
type: RelaxedAtomicBool
value: true
mirror: always
# Whether we always print silently (without a print dialog).
- name: print.always_print_silent
type: RelaxedAtomicBool
value: false
mirror: always
# Whether tab_modal print UI is enabled.
#
# The tab modal print dialog is currently only for early beta or nightly.
- name: print.tab_modal.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# Whether the pages per sheet print setting is enabled.
- name: print.pages_per_sheet.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# Whether we allow the print progress dialog to show up.
- name: print.show_print_progress
type: RelaxedAtomicBool
value: true
mirror: always
# The default DPI for printing.
#
# For PDF-based output, DPI should ideally be irrelevant, but in fact it is not
# for multiple reasons:
#
# * Layout code that tries to respect device pixels (e.g. for snapping glyph
# positions and baselines, and especially for the "GDI Classic"
# rendering-mode threshold for certain fonts).
#
# * The limitations of the PDF format mean that we can't natively represent
# certain effects, such as filters, in PDF output, so we need to rasterize
# the parts of the document with these applied.
#
# * Other rasterized things like images and such are also affected by DPI
# (both in the output, and the images we select via srcset, for example).
#
# Therefore, using a high DPI is preferable. For now, we use 144dpi to match
# physical printer output on Windows, but higher (e.g. 300dpi) might be better
# if it does not lead to issues such as excessive memory use.
- name: print.default_dpi
type: float
value: 144.0f
mirror: always
# Whether support for monochrome printing is enabled for CUPS.
- name: print.cups.monochrome.enabled
type: RelaxedAtomicBool
value: true
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "privacy."
#---------------------------------------------------------------------------
- name: privacy.file_unique_origin
type: bool
value: true
mirror: always
- name: privacy.fuzzyfox.clockgrainus
type: RelaxedAtomicUint32
value: 100
mirror: always
# Annotate trackers using the strict list. If set to false, the basic list will
# be used instead.
- name: privacy.annotate_channels.strict_list.enabled
type: bool
value: @IS_EARLY_BETA_OR_EARLIER@
mirror: always
# First Party Isolation (double keying), disabled by default.
- name: privacy.firstparty.isolate
type: RelaxedAtomicBool
value: false
mirror: always
# If false, two windows in the same domain with different first party domains
# (top level URLs) can access resources through window.opener. This pref is
# effective only when "privacy.firstparty.isolate" is true.
- name: privacy.firstparty.isolate.restrict_opener_access
type: RelaxedAtomicBool
value: true
mirror: always
- name: privacy.firstparty.isolate.block_post_message
type: RelaxedAtomicBool
value: false
mirror: always
- name: privacy.firstparty.isolate.use_site
type: RelaxedAtomicBool
value: false
mirror: always
# Enforce tracking protection in all modes.
- name: privacy.trackingprotection.enabled
type: bool
value: false
mirror: always
# Enforce tracking protection in Private Browsing mode.
- name: privacy.trackingprotection.pbmode.enabled
type: bool
value: true
mirror: always
# Annotate channels based on the tracking protection list in all modes
- name: privacy.trackingprotection.annotate_channels
type: bool
value: true
mirror: always
# Block 3rd party fingerprinting resources.
- name: privacy.trackingprotection.fingerprinting.enabled
type: bool
value: false
mirror: always
# Block 3rd party cryptomining resources.
- name: privacy.trackingprotection.cryptomining.enabled
type: bool
value: false
mirror: always
# Block 3rd party socialtracking resources.
- name: privacy.trackingprotection.socialtracking.enabled
type: bool
value: false
mirror: always
# Consider socialtracking annotation as trackers (see ETP).
- name: privacy.socialtracking.block_cookies.enabled
type: bool
value: true
mirror: always
# Whether Origin Telemetry should be enabled.
# NOTE: if telemetry.origin_telemetry_test_mode.enabled is enabled, this pref
# won't have any effect.
- name: privacy.trackingprotection.origin_telemetry.enabled
type: RelaxedAtomicBool
value: @IS_NIGHTLY_BUILD@
mirror: always
- name: privacy.trackingprotection.testing.report_blocked_node
type: RelaxedAtomicBool
value: false
mirror: always
# Whether to spoof user locale to English (used as part of Resist
# Fingerprinting).
# 0 - will prompt
# 1 - don't spoof
# 2 - spoof
- name: privacy.spoof_english
type: RelaxedAtomicUint32
value: 0
mirror: always
# Send "do not track" HTTP header, disabled by default.
- name: privacy.donottrackheader.enabled
type: bool
value: false
mirror: always
# Lower the priority of network loads for resources on the tracking protection
# list. Note that this requires the
# privacy.trackingprotection.annotate_channels pref to be on in order to have
# any effect.
- name: privacy.trackingprotection.lower_network_priority
type: bool
value: @IS_NIGHTLY_BUILD@
mirror: always
# A subset of Resist Fingerprinting protections focused specifically on timers.
# This affects the Animation API, the performance APIs, Date.getTime,
# Event.timestamp, File.lastModified, audioContext.currentTime,
# canvas.captureStream.currentTime.
- name: privacy.reduceTimerPrecision
type: RelaxedAtomicBool
value: true
mirror: always
# If privacy.reduceTimerPrecision is false, this pref controls whether or not
# to clamp all timers at a fixed 20 microsconds. It should always be enabled,
# and is only specified as a pref to enable an emergency disabling in the event
# of catastrophic failure.
- name: privacy.reduceTimerPrecision.unconditional
type: RelaxedAtomicBool
value: true
mirror: always
# The resistFingerprinting variables are marked with 'Relaxed' memory ordering.
# We don't particurally care that threads have a percently consistent view of
# the values of these prefs. They are not expected to change often, and having
# an outdated view is not particurally harmful. They will eventually become
# consistent.
#
# The variables will, however, be read often (specifically .microseconds on
# each timer rounding) so performance is important.
- name: privacy.resistFingerprinting
type: RelaxedAtomicBool
value: false
mirror: always
# We automatically decline canvas permission requests if they are not initiated
# from user input. Just in case that breaks something, we allow the user to
# revert this behavior with this obscure pref. We do not intend to support this
# long term. If you do set it, to work around some broken website, please file
# a bug with information so we can understand why it is needed.
- name: privacy.resistFingerprinting.autoDeclineNoUserInputCanvasPrompts
type: bool
value: true
mirror: always
# Whether canvas extraction should result in random data. If false, canvas
# extraction results in all-white, opaque pixel data.
- name: privacy.resistFingerprinting.randomDataOnCanvasExtract
type: RelaxedAtomicBool
value: true
mirror: always
# The log level for browser console messages logged in RFPHelper.jsm. Change to
# 'All' and restart to see the messages.
- name: privacy.resistFingerprinting.jsmloglevel
type: String
value: "Warn"
mirror: never
# Enable jittering the clock one precision value forward.
- name: privacy.resistFingerprinting.reduceTimerPrecision.jitter
type: RelaxedAtomicBool
value: true
mirror: always
# Dynamically tune the resolution of the timer reduction for
# `privacy.reduceTimerPrecision` and `privacy.resistFingerprinting`.
- name: privacy.resistFingerprinting.reduceTimerPrecision.microseconds
type: RelaxedAtomicUint32
value: 1000
mirror: always
- name: privacy.resistFingerprinting.target_video_res
type: uint32_t
value: 480
mirror: always
# Anti-tracking permission expiration.
- name: privacy.restrict3rdpartystorage.expiration
type: uint32_t
value: 2592000 # 30 days (in seconds)
mirror: always
# Report Anti-tracking warnings to console lazily
- name: privacy.restrict3rdpartystorage.console.lazy
type: bool
value: true
mirror: always
# Enable the heuristic to allow storage access for windows opened using window.open() after user interaction
- name: privacy.restrict3rdpartystorage.heuristic.opened_window_after_interaction
type: bool
value: true
mirror: always
# Enable the heuristic to allow storage access for windows opened using window.open()
- name: privacy.restrict3rdpartystorage.heuristic.window_open
type: bool
value: true
mirror: always
# Enable the heuristic to allow storage access for windows opened using window.open()
- name: privacy.restrict3rdpartystorage.heuristic.redirect
type: bool
value: true
mirror: always
# Anti-tracking permission expiration.
- name: privacy.restrict3rdpartystorage.expiration_redirect
type: uint32_t
value: 900 # 15 minutes
mirror: always
# Anti-tracking user-interaction expiration.
- name: privacy.userInteraction.expiration
type: uint32_t
value: 3888000 # 45 days (in seconds)
mirror: always
# Anti-tracking user-interaction document interval.
- name: privacy.userInteraction.document.interval
type: uint32_t
value: 1800 # 30 minutes (in seconds)
mirror: always
# Enable Anti-tracking testing. When it enables, it will notify the observers
# when user-interaction permission or storage access permission is added. This
# is for testing only.
- name: privacy.antitracking.testing
type: bool
value: false
mirror: always
# Enable the heuristic to allow storage access for recent visited pages
- name: privacy.restrict3rdpartystorage.heuristic.recently_visited
type: bool
value: true
mirror: always
# Valid time gap since last visit
- name: privacy.restrict3rdpartystorage.heuristic.recently_visited_time
type: uint32_t
value: 600 # 10 minutes
mirror: always
# Recent visited pages redirection permission expiration.
- name: privacy.restrict3rdpartystorage.expiration_visited
type: uint32_t
value: 2592000 # 30 days (in seconds)
mirror: always
# Maximum client-side cookie life-time cap. Measured in seconds, set to 0 to
# disable.
- name: privacy.documentCookies.maxage
type: uint32_t
value: 0
mirror: always
- name: privacy.storagePrincipal.enabledForTrackers
type: RelaxedAtomicBool
value: false
mirror: always
- name: privacy.window.maxInnerWidth
type: int32_t
value: 1000
mirror: always
- name: privacy.window.maxInnerHeight
type: int32_t
value: 1000
mirror: always
- name: privacy.sanitize.sanitizeOnShutdown
type: RelaxedAtomicBool
value: false
mirror: always
- name: privacy.clearOnShutdown.cache
type: RelaxedAtomicBool
value: false
mirror: always
- name: privacy.dynamic_firstparty.limitForeign
type: RelaxedAtomicBool
value: false
mirror: always
- name: privacy.dynamic_firstparty.use_site
type: RelaxedAtomicBool
value: true
mirror: always
- name: privacy.partition.network_state
type: RelaxedAtomicBool
value: true
mirror: always
- name: privacy.partition.bloburl_per_agent_cluster
type: RelaxedAtomicBool
value: @IS_NIGHTLY_BUILD@
mirror: always
- name: privacy.window.name.update.enabled
type: bool
value: true
mirror: always
# By default, the network state isolation is not active when there is a proxy
# setting. This pref forces the network isolation even in these scenarios.
- name: privacy.partition.network_state.connection_with_proxy
type: bool
value: false
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "prompts."
#---------------------------------------------------------------------------
# Prompt modal type prefs
# See nsIPromptService::MODAL_TYPE fields for possible values.
# Insecure form submit warning.
- name: prompts.modalType.insecureFormSubmit
type: int32_t
value: 2
mirror: always
# nsHttpChannelAuthProvider#ConfirmAuth anti-phishing prompts.
- name: prompts.modalType.confirmAuth
type: int32_t
value: 2
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "security."
#---------------------------------------------------------------------------
# Mochitests that need to load resource:// URIs not declared content-accessible
# in manifests should set this pref.
- name: security.all_resource_uri_content_accessible
type: bool
value: false
mirror: always
- name: security.bad_cert_domain_error.url_fix_enabled
type: bool
value: true
mirror: always
- name: security.csp.enable
type: bool
value: true
mirror: always
- name: security.csp.reporting.script-sample.max-length
type: int32_t
value: 40
mirror: always
- name: security.csp.truncate_blocked_uri_for_frame_navigations
type: bool
value: true
mirror: always
# Allows loading ui resources in CheckLoadURIFlags
# TODO Bug 1654488: Remove pref in CheckLoadURIFlags
# which allows all UI resources to load
- name: security.caps.allow_uri_is_ui_resource_in_checkloaduriflags
type: bool
value: false
mirror: always
# If true, all toplevel data: URI navigations will be blocked.
# Please note that manually entering a data: URI in the
# URL-Bar will not be blocked when flipping this pref.
- name: security.data_uri.block_toplevel_data_uri_navigations
type: bool
value: true
mirror: always
# Whether window A is allowed to navigate cross-origin window B (that is not
# a descendant frame of A) to a URI that loads externally.
- name: security.allow_disjointed_external_uri_loads
type: bool
value: false
mirror: always
# Allowed by default so it doesn't affect Thunderbird/SeaMonkey, but
# not allowed for Firefox Desktop in firefox.js
- name: security.allow_parent_unrestricted_js_loads
type: RelaxedAtomicBool
value: true
mirror: always
# Allowed by default so it doesn't affect Thunderbird/SeaMonkey, but
# not allowed for Firefox Desktop in firefox.js
- name: security.allow_eval_with_system_principal
type: RelaxedAtomicBool
value: true
mirror: always
# Allowed by default so it doesn't affect Thunderbird/SeaMonkey, but
# not allowed for Firefox Desktop in firefox.js
- name: security.allow_eval_in_parent_process
type: RelaxedAtomicBool
value: true
mirror: always
# Disallowed by default, ensure not disallowed content is loaded in the parent
# process.
- name: security.allow_unsafe_parent_loads
type: bool
value: false
mirror: always
# Pref to block mixed scripts (fonts, plugin content, scripts, stylesheets,
# iframes, websockets, XHR).
- name: security.mixed_content.block_active_content
type: bool
value: @IS_ANDROID@
mirror: always
# Pref to block sub requests that happen within an object.
- name: security.mixed_content.block_object_subrequest
type: bool
value: false
mirror: always
# Pref for mixed display content blocking (images, audio, video).
- name: security.mixed_content.block_display_content
type: bool
value: false
mirror: always
# Pref for mixed display content upgrading (images, audio, video).
- name: security.mixed_content.upgrade_display_content
type: bool
value: @IS_NIGHTLY_BUILD@
mirror: always
# Whether strict file origin policy is in effect. "False" is traditional.
- name: security.fileuri.strict_origin_policy
type: RelaxedAtomicBool
value: true
mirror: always
# The level to which we sandbox the content process. firefox.js sets the
# default to different values on a per-OS basis, and has documentation
# on what the defaults are and what the numbers mean.
- name: security.sandbox.content.level
type: int32_t
value: 0
mirror: always
do_not_use_directly: true # Consumers should use SandboxSettings to ask.
- name: security.sandbox.socket.process.level
type: int32_t
value: 0
mirror: always
do_not_use_directly: true # Consumers should use SandboxSettings to ask.
#if defined(XP_WIN) && defined(MOZ_SANDBOX)
# Whether win32k is disabled for content processes.
# true means win32k system calls are not permitted.
- name: security.sandbox.content.win32k-disable
type: RelaxedAtomicBool
value: false
mirror: always
# Note: win32k is currently _not_ disabled for GMP due to intermittent test
# failures, where the GMP process fails very early. See bug 1449348.
- name: security.sandbox.gmp.win32k-disable
type: RelaxedAtomicBool
value: false
mirror: always
# Whether win32k is disabled for socket processes.
# true means win32k system calls are not permitted.
- name: security.sandbox.socket.win32k-disable
type: RelaxedAtomicBool
value: true
mirror: always
# Whether CET Shadow Stacks Strict mode is enabled for the content processes.
- name: security.sandbox.content.shadow-stacks-strict
type: RelaxedAtomicBool
value: false
mirror: always
# Whether CET Shadow Stacks Strict mode is enabled for the RDD processes.
- name: security.sandbox.rdd.shadow-stacks-strict
type: RelaxedAtomicBool
value: false
mirror: always
# Whether CET Shadow Stacks Strict mode is enabled for the socket processes.
- name: security.sandbox.socket.shadow-stacks-strict
type: RelaxedAtomicBool
value: false
mirror: always
# Whether CET Shadow Stacks Strict mode is enabled for the GPU processes.
- name: security.sandbox.gpu.shadow-stacks-strict
type: RelaxedAtomicBool
value: false
mirror: always
# Whether CET Shadow Stacks Strict mode is enabled for the GMP processes.
- name: security.sandbox.gmp.shadow-stacks-strict
type: RelaxedAtomicBool
value: false
mirror: always
# This controls the depth of stack trace that is logged when Windows sandbox
# logging is turned on. This is only currently available for the content
# process because the only other sandbox (for GMP) has too strict a policy to
# allow stack tracing. This does not require a restart to take effect.
- name: security.sandbox.windows.log.stackTraceDepth
type: RelaxedAtomicUint32
value: 0
mirror: always
#endif
#if defined(XP_LINUX) && defined(MOZ_SANDBOX)
# Run content processes in headless mode and disallow connections to
# the X server. Experimental; breaks WebGL and Flash, and requires
# `widget.non-native-theme.enabled` and `widget.remote-look-and-feel`.
# Changing it requires a restart because sandbox policy information dependent
# on it is cached. See bug 1640345 for details.
- name: security.sandbox.content.headless
type: bool
value: false
mirror: once
#endif
# Pref to show warning when submitting from secure to insecure.
- name: security.warn_submit_secure_to_insecure
type: bool
value: true
mirror: always
# Hardware Origin-bound Second Factor Support
- name: security.webauth.webauthn
type: bool
value: true
mirror: always
# Navigate-to CSP 3 directive
- name: security.csp.enableNavigateTo
type: bool
value: false
mirror: always
# No way to enable on Android, Bug 1552602
- name: security.webauth.u2f
type: bool
value: @IS_NOT_ANDROID@
mirror: always
# Block Worker/SharedWorker scripts with wrong MIME type.
- name: security.block_Worker_with_wrong_mime
type: bool
value: true
mirror: always
# Cancel outgoing requests from SystemPrincipal
- name: security.cancel_non_local_loads_triggered_by_systemprincipal
type: bool
value: false
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "slider."
#---------------------------------------------------------------------------
# Scrollbar snapping region.
# - 0: off
# - 1 and higher: slider thickness multiple
- name: slider.snapMultiplier
type: int32_t
#ifdef XP_WIN
value: 6
#else
value: 0
#endif
mirror: once
#---------------------------------------------------------------------------
# Prefs starting with "storage."
#---------------------------------------------------------------------------
# Whether to use a non-exclusive VFS.
# By default we use the unix-excl VFS, for the following reasons:
# 1. It improves compatibility with NFS shares, whose implementation
# is incompatible with SQLite's locking requirements (reliable fcntl), and
# in particular with WAL journaling.
# Bug 433129 attempted to automatically identify such file-systems,
# but a reliable way was not found and the fallback locking is slower than
# POSIX locking, so we do not want to do it by default.
# 2. It allows wal mode to avoid the memory mapped -shm file, reducing the
# likelihood of SIGBUS failures when disk space is exhausted.
# 3. It provides some protection from third party database tampering while a
# connection is open.
# Note there's no win32-excl VFS, so this has no effect on Windows.
- name: storage.sqlite.exclusiveLock.enabled
type: RelaxedAtomicBool
value: @IS_NOT_ANDROID@
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "svg."
#---------------------------------------------------------------------------
# This pref controls whether the 'context-fill' and 'context-stroke' keywords
# can be used in SVG-as-an-image in the content processes to use the fill/
# stroke specified on the element that embeds the image. (These keywords are
# always enabled in the chrome process, regardless of this pref.) Also, these
# keywords are currently not part of any spec, which is partly why we disable
# them for web content.
- name: svg.context-properties.content.enabled
type: bool
value: false
mirror: always
# Enable the use of display-lists for SVG hit-testing.
- name: svg.display-lists.hit-testing.enabled
type: bool
value: true
mirror: always
# Enable the use of display-lists for SVG painting.
- name: svg.display-lists.painting.enabled
type: bool
value: true
mirror: always
# Is support for the new getBBox method from SVG 2 enabled?
# See https://svgwg.org/svg2-draft/single-page.html#types-SVGBoundingBoxOptions
- name: svg.new-getBBox.enabled
type: bool
value: false
mirror: always
# Is support for letter-spacing and word-spacing in SVG text enabled?
- name: svg.text-spacing.enabled
type: bool
value: true
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "telemetry."
#---------------------------------------------------------------------------
# Enable origin telemetry test mode or not
# NOTE: turning this on will override the
# privacy.trackingprotection.origin_telemetry.enabled pref.
- name: telemetry.origin_telemetry_test_mode.enabled
type: RelaxedAtomicBool
value: false
mirror: always
- name: telemetry.number_of_site_origin.min_interval
type: uint32_t
value: 300000
mirror: always
- name: telemetry.fog.test.localhost_port
type: RelaxedAtomicInt32
value: 0
mirror: always
rust: true
- name: telemetry.fog.test.activity_limit
type: RelaxedAtomicUint32
value: 120
mirror: always
rust: true
- name: telemetry.fog.test.inactivity_limit
type: RelaxedAtomicUint32
value: 1200
mirror: always
rust: true
#---------------------------------------------------------------------------
# Prefs starting with "test."
#---------------------------------------------------------------------------
- name: test.events.async.enabled
type: RelaxedAtomicBool
value: false
mirror: always
- name: test.mousescroll
type: RelaxedAtomicBool
value: false
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "thread."
#---------------------------------------------------------------------------
- name: threads.medium_high_event_queue.enabled
type: RelaxedAtomicBool
value: true
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "timer."
#---------------------------------------------------------------------------
# Since our timestamp on macOS does not increment while the system is asleep, we
# should ignore sleep/wake notifications to make timer thread process timers.
- name: timer.ignore_sleep_wake_notifications
type: RelaxedAtomicBool
#ifdef XP_MACOSX
value: true
#else
value: false
#endif
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "toolkit."
#---------------------------------------------------------------------------
# Returns true if BHR is disabled.
- name: toolkit.content-background-hang-monitor.disabled
type: bool
value: false
mirror: always
- name: toolkit.scrollbox.horizontalScrollDistance
type: RelaxedAtomicInt32
value: 5
mirror: always
- name: toolkit.scrollbox.verticalScrollDistance
type: RelaxedAtomicInt32
value: 3
mirror: always
# The lateWriteChecksStage and fastShutdownStage below represent the stage
# of shutdown after which we (for lateWriteChecksStage) crash / gather
# telemetry data on file writes, or (for fastShutdownStage) we call _exit(0).
# Higher values are earlier during shutdown, and the full enumeration can
# be found in AppShutdown.h in the AppShutdownPhase enum.
- name: toolkit.shutdown.lateWriteChecksStage
type: int32_t
#ifdef MOZ_CODE_COVERAGE
value: 0
#else
value: 3
#endif
mirror: always
# See the comment above toolkit.shutdown.lateWriteChecksStage. A higher value
# for this pref means we call _exit(0) earlier during shutdown.
- name: toolkit.shutdown.fastShutdownStage
type: int32_t
#if !defined(DEBUG) && !defined(MOZ_ASAN) && !defined(MOZ_TSAN) && !defined(MOZ_CODE_COVERAGE) && !defined(MOZ_VALGRIND) && !defined(MOZ_PROFILE_GENERATE) && !defined(JS_STRUCTURED_SPEW)
#ifdef NIGHTLY_BUILD
value: 3
#else
value: 1
#endif
#else
value: 0
#endif
mirror: always
# Sending each remote accumulation immediately places undue strain on the IPC
# subsystem. Batch the remote accumulations for a period of time before sending
# them all at once. This value was chosen as a balance between data timeliness
# and performance (see bug 1218576).
- name: toolkit.telemetry.ipcBatchTimeout
type: uint32_t
value: 2000
mirror: always
- name: toolkit.telemetry.geckoview.batchDurationMS
type: RelaxedAtomicUint32
value: 5000
mirror: always
- name: toolkit.telemetry.geckoview.maxBatchStalenessMS
type: RelaxedAtomicUint32
value: 60000
mirror: always
- name: toolkit.telemetry.geckoview.streaming
type: RelaxedAtomicBool
value: false
mirror: always
- name: toolkit.telemetry.testing.overrideProductsCheck
type: RelaxedAtomicBool
value: false
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "ui."
#---------------------------------------------------------------------------
- name: ui.key.generalAccessKey
type: int32_t
value: -1
mirror: always
# Only used if generalAccessKey is -1.
- name: ui.key.chromeAccess
type: int32_t
#ifdef XP_MACOSX
# 0 = disabled, 1 = Shift, 2 = Ctrl, 4 = Alt, 3 = ctrl+shift, 8 = Meta
value: 2
#else
# 0 = disabled, 1 = Shift, 2 = Ctrl, 4 = Alt, 5 = Alt+Shift,
# 8 = Meta, 16 = Win
value: 4
#endif
mirror: always
# Only used if generalAccessKey is -1.
- name: ui.key.contentAccess
type: int32_t
#ifdef XP_MACOSX
# 0 = disabled, 1 = Shift, 2 = Ctrl, 4 = Alt, 3 = ctrl+shift, 8 = Meta
value: 6
#else
# 0 = disabled, 1 = Shift, 2 = Ctrl, 4 = Alt, 5 = Alt+Shift,
# 8 = Meta, 16 = Win
value: 5
#endif
mirror: always
# Does the access key by itself focus the menu bar?
- name: ui.key.menuAccessKeyFocuses
type: bool
#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
# On Windows and Linux, we now default to showing the menu bar only when alt
# is pressed.
value: true
#else
value: false
#endif
mirror: always
# Duration of timeout of incremental search in menus (ms). 0 means infinite.
- name: ui.menu.incremental_search.timeout
type: uint32_t
value: 1000
mirror: always
# If true, all popups won't hide automatically on blur
- name: ui.popup.disable_autohide
type: RelaxedAtomicBool
value: false
mirror: always
# Negate scroll, true will make the mouse scroll wheel move the screen the
# same direction as with most desktops or laptops.
- name: ui.scrolling.negate_wheel_scroll
type: RelaxedAtomicBool
value: @IS_ANDROID@
mirror: always
# If the user puts a finger down on an element and we think the user might be
# executing a pan gesture, how long do we wait before tentatively deciding the
# gesture is actually a tap and activating the target element?
- name: ui.touch_activation.delay_ms
type: int32_t
value: 100
mirror: always
# If the user has clicked an element, how long do we keep the :active state
# before it is cleared by the mouse sequences fired after a
# touchstart/touchend.
- name: ui.touch_activation.duration_ms
type: int32_t
value: 10
mirror: always
# Prevent system colors from being exposed to CSS or canvas.
- name: ui.use_standins_for_native_colors
type: RelaxedAtomicBool
value: false
mirror: always
# Disable page loading activity cursor by default.
- name: ui.use_activity_cursor
type: bool
value: false
mirror: always
# Whether context menus should only appear on mouseup instead of mousedown,
# on OSes where they normally appear on mousedown (macOS, *nix).
# Note: ignored on Windows (context menus always use mouseup).
- name: ui.context_menus.after_mouseup
type: bool
value: false
mirror: always
# Whether click-hold context menus are enabled.
- name: ui.click_hold_context_menus
type: RelaxedAtomicBool
value: false
mirror: always
# How long to wait for a drag gesture before displaying click-hold context menu,
# in milliseconds.
- name: ui.click_hold_context_menus.delay
type: RelaxedAtomicInt32
value: 500
mirror: always
# When enabled, the touch.radius and mouse.radius prefs allow events to be
# dispatched to nearby elements that are sensitive to the event. See
# PositionedEventTargeting.cpp. The 'mm' prefs define a rectangle around the
# nominal event target point within which we will search for suitable elements.
# 'visitedWeight' is a percentage weight; a value > 100 makes a visited link be
# treated as further away from the event target than it really is, while a
# value < 100 makes a visited link be treated as closer to the event target
# than it really is.
- name: ui.touch.radius.enabled
type: bool
value: @IS_ANDROID@
mirror: always
- name: ui.touch.radius.topmm
type: uint32_t
#ifdef ANDROID
value: 5
#else
value: 12
#endif
mirror: always
- name: ui.touch.radius.rightmm
type: uint32_t
#ifdef ANDROID
value: 3
#else
value: 8
#endif
mirror: always
- name: ui.touch.radius.bottommm
type: uint32_t
#ifdef ANDROID
value: 2
#else
value: 4
#endif
mirror: always
- name: ui.touch.radius.leftmm
type: uint32_t
#ifdef ANDROID
value: 3
#else
value: 8
#endif
mirror: always
- name: ui.touch.radius.visitedWeight
type: uint32_t
value: 120
mirror: always
- name: ui.mouse.radius.enabled
type: bool
value: @IS_ANDROID@
mirror: always
- name: ui.mouse.radius.topmm
type: uint32_t
#ifdef ANDROID
value: 5
#else
value: 12
#endif
mirror: always
- name: ui.mouse.radius.rightmm
type: uint32_t
#ifdef ANDROID
value: 3
#else
value: 8
#endif
mirror: always
- name: ui.mouse.radius.bottommm
type: uint32_t
#ifdef ANDROID
value: 2
#else
value: 4
#endif
mirror: always
- name: ui.mouse.radius.leftmm
type: uint32_t
#ifdef ANDROID
value: 3
#else
value: 8
#endif
mirror: always
- name: ui.mouse.radius.visitedWeight
type: uint32_t
value: 120
mirror: always
- name: ui.mouse.radius.reposition
type: bool
value: @IS_ANDROID@
mirror: always
# When true, the ui.mouse.radius.* prefs will only affect simulated mouse
# events generated by touch input. When false, the prefs will be used for all
# mouse events.
- name: ui.mouse.radius.inputSource.touchOnly
type: bool
value: true
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "urlclassifier."
#---------------------------------------------------------------------------
# Update server response timeout for Safe Browsing.
- name: urlclassifier.update.response_timeout_ms
type: uint32_t
value: 30000
mirror: always
# Download update timeout for Safe Browsing.
- name: urlclassifier.update.timeout_ms
type: uint32_t
value: 90000
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "view_source."
#---------------------------------------------------------------------------
- name: view_source.editor.external
type: bool
value: false
mirror: always
- name: view_source.wrap_long_lines
type: bool
value: @IS_ANDROID@
mirror: always
- name: view_source.syntax_highlight
type: bool
value: true
mirror: always
- name: view_source.tab_size
type: int32_t
value: 4
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "webgl." (for pref access from Worker threads)
#---------------------------------------------------------------------------
- name: webgl.1.allow-core-profiles
type: RelaxedAtomicBool
#ifdef XP_MACOSX
value: true
#else
value: false
#endif
mirror: always
- name: webgl.all-angle-options
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.angle.force-d3d11
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.angle.try-d3d11
type: RelaxedAtomicBool
#ifdef XP_WIN
value: true
#else
value: false
#endif
mirror: always
- name: webgl.angle.force-warp
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.can-lose-context-in-foreground
type: RelaxedAtomicBool
value: true
mirror: always
- name: webgl.cgl.multithreaded
type: RelaxedAtomicBool
value: true
mirror: always
- name: webgl.debug.incomplete-tex-color
type: RelaxedAtomicUint32
value: 0
mirror: always
- name: webgl.default-antialias
type: RelaxedAtomicBool
value: @IS_NOT_ANDROID@
mirror: always
- name: webgl.default-no-alpha
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.disable-angle
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.disable-wgl
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.dxgl.enabled
type: RelaxedAtomicBool
#ifdef XP_WIN
value: true
#else
value: false
#endif
mirror: always
- name: webgl.dxgl.needs-finish
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.disable-fail-if-major-performance-caveat
type: RelaxedAtomicBool
value: true
mirror: always
- name: webgl.disable-DOM-blit-uploads
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.disabled
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.enable-debug-renderer-info
type: RelaxedAtomicBool
value: true
mirror: always
- name: webgl.enable-draft-extensions
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.enable-privileged-extensions
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.enable-surface-texture
type: RelaxedAtomicBool
value: true
mirror: always
- name: webgl.enable-ahardwarebuffer
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.enable-webgl2
type: RelaxedAtomicBool
value: true
mirror: always
- name: webgl.force-enabled
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.force-layers-readback
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.force-index-validation
type: RelaxedAtomicInt32
value: 0
mirror: always
- name: webgl.lose-context-on-memory-pressure
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.max-contexts
type: RelaxedAtomicUint32
value: 1000
mirror: always
- name: webgl.max-contexts-per-principal
type: RelaxedAtomicUint32
value: 300
mirror: always
- name: webgl.max-warnings-per-context
type: RelaxedAtomicUint32
value: 32
mirror: always
- name: webgl.min_capability_mode
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.msaa-force
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.msaa-samples
type: RelaxedAtomicUint32
value: 4
mirror: always
- name: webgl.out-of-process
type: RelaxedAtomicBool
#if defined(XP_MACOSX) || defined(XP_WIN)
value: true
#else
value: false
#endif
mirror: always
- name: webgl.out-of-process.force
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.out-of-process.shmem-size
type: RelaxedAtomicUint32
value: 100000 # 100KB
mirror: always
- name: webgl.power-preference-override
type: RelaxedAtomicInt32
value: 0
mirror: always
- name: webgl.prefer-16bpp
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.allow-immediate-queries
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.allow-fb-invalidation
type: RelaxedAtomicBool
value: false
mirror: always
- name: webgl.perf.max-warnings
type: RelaxedAtomicInt32
value: 0
mirror: always
- name: webgl.perf.max-acceptable-fb-status-invals
type: RelaxedAtomicInt32
value: 0
mirror: always
- name: webgl.perf.spew-frame-allocs
type: RelaxedAtomicBool
value: true
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "widget."
#---------------------------------------------------------------------------
# Global user preference for disabling native theme in content processes.
#
# NOTE(emilio): When changing this make sure to update the non_native_theme
# entry in python/mozbuild/mozbuild/mozinfo.py
- name: widget.non-native-theme.enabled
type: RelaxedAtomicBool
#if defined(XP_LINUX) && defined(NIGHTLY_BUILD) && !defined(ANDROID)
value: true
#elif defined(XP_MACOSX) && defined(NIGHTLY_BUILD)
value: true
#else
value: false
#endif
mirror: always
# The size in CSS pixels at full zoom of the minimum scrollbar width.
- name: widget.non-native-theme.gtk.scrollbar.normal-size
type: uint32_t
value: 12
mirror: always
# The size in CSS pixels at full zoom of the "thin" scrollbars.
- name: widget.non-native-theme.gtk.scrollbar.thin-size
type: uint32_t
value: 6
mirror: always
# The amount of space that the thumb should fill the scrollbar, from zero to
# one.
- name: widget.non-native-theme.gtk.scrollbar.thumb-size
type: float
value: 0.75
mirror: always
# The minimum size of the scroll thumb, in the scrollbar direction.
- name: widget.non-native-theme.gtk.scrollbar.thumb-cross-size
type: uint32_t
value: 40
mirror: always
# Whether the thumb should be rounded for the non-native scrollbars.
- name: widget.non-native-theme.gtk.scrollbar.round-thumb
type: bool
value: true
mirror: always
# Whether buttons shouldn't be suppressed for non-native scrollbars.
- name: widget.non-native-theme.gtk.scrollbar.allow-buttons
type: bool
value: false
mirror: always
# Whether we should use the default accent color or the theme-provided one.
#
# TODO(emilio): This should probably do the right thing in most other
# platforms, but stick to the standard colors on those.
- name: widget.non-native-theme.use-theme-accent
type: bool
#ifdef MOZ_WIDGET_GTK
value: true
#else
value: false
#endif
mirror: always
# Whether we should try to use WebRender to render widgets.
- name: widget.non-native-theme.webrender
type: bool
value: true
mirror: always
# Preference to disable dark scrollbar implementation.
# This is mainly for testing because dark scrollbars have to be semi-
# transparent, but many reftests expect scrollbars to look identical
# among different backgrounds.
# However, some users may want to disable this as well.
- name: widget.disable-dark-scrollbar
type: bool
value: false
mirror: always
- name: widget.window-transforms.disabled
type: RelaxedAtomicBool
value: false
mirror: always
# Whether to allow gtk dark themes in content.
- name: widget.content.allow-gtk-dark-theme
type: bool
value: false
mirror: always
# Whether to use gtk high contrast themes to disable content styling like on
# windows high contrast mode.
- name: widget.content.gtk-high-contrast.enabled
type: bool
value: true
mirror: always
# Whether to pause the compositor when a native window is minimized.
- name: widget.pause-compositor-when-minimized
type: bool
value: true
mirror: always
#ifdef MOZ_WAYLAND
#ifdef NIGHTLY_BUILD
# Keep those pref hidden on non-nightly builds to avoid people accidentally
# turning it on.
# Use DMABuf for content textures.
# For testing purposes only.
- name: widget.dmabuf-textures.enabled
type: RelaxedAtomicBool
value: false
mirror: always
#endif
# Use smooth rendering for Wayland basic compositor.
- name: widget.wayland-smooth-rendering
type: RelaxedAtomicBool
value: false
mirror: always
# Use DMABuf backend for WebGL.
- name: widget.dmabuf-webgl.enabled
type: RelaxedAtomicBool
value: true
mirror: always
# Use opaque region for MozContainer wl_surface
- name: widget.wayland.opaque-region.enabled
type: RelaxedAtomicBool
value: true
mirror: always
#endif
# Enable the RemoteLookAndFeel in content processes, which will cause all
# LookAndFeel values to be queried in the parent process and sent to content
# processes using IPC. This is required for widgets to paint and behave
# correctly when `security.sandbox.content.headless` is enabled.
- name: widget.remote-look-and-feel
type: bool
#ifdef MOZ_WIDGET_GTK
value: true
#else
value: false
#endif
mirror: once
#---------------------------------------------------------------------------
# Prefs starting with "xul."
#---------------------------------------------------------------------------
# Pref to control whether arrow-panel animations are enabled or not.
# Transitions are currently disabled on Linux due to rendering issues on
# certain configurations.
- name: xul.panel-animations.enabled
type: bool
#ifdef MOZ_WIDGET_GTK
value: false
#else
value: true
#endif
mirror: always
#---------------------------------------------------------------------------
# Prefs starting with "zoom."
#---------------------------------------------------------------------------
- name: zoom.maxPercent
type: uint32_t
#ifdef ANDROID
value: 400
#else
value: 500
#endif
mirror: always
- name: zoom.minPercent
type: uint32_t
#ifdef ANDROID
value: 20
#else
value: 30
#endif
mirror: always
#---------------------------------------------------------------------------
# End of prefs
#---------------------------------------------------------------------------
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