Bug 1839845 - Add about:settings as alias of about:preferences. r=Gijs,settings-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D202594

browser/components/about/AboutRedirector.cpp

@@ -141,6 +141,9 @@ static const RedirEntry kRedirMap[] = {
          nsIAboutModule::URI_MUST_LOAD_IN_CHILD | nsIAboutModule::ALLOW_SCRIPT |
          nsIAboutModule::URI_CAN_LOAD_IN_PRIVILEGEDABOUT_PROCESS |
          nsIAboutModule::HIDE_FROM_ABOUTABOUT},
+    {"settings", "chrome://browser/content/preferences/preferences.xhtml",
+     nsIAboutModule::ALLOW_SCRIPT | nsIAboutModule::IS_SECURE_CHROME_UI |
+         nsIAboutModule::HIDE_FROM_ABOUTABOUT},
     {"preferences", "chrome://browser/content/preferences/preferences.xhtml",
      nsIAboutModule::ALLOW_SCRIPT | nsIAboutModule::IS_SECURE_CHROME_UI},
     {"downloads",

browser/components/about/components.conf

@@ -31,6 +31,7 @@ pages = [
     'rights',
     'robots',
     'sessionrestore',
+    'settings',
     'shoppingsidebar',
     'tabcrashed',
     'unloads',

browser/components/preferences/home.js

@@ -344,12 +344,15 @@ var gHomePane = {
   },
 
   /**
-   * _isTabAboutPreferences: Is a given tab set to about:preferences?
+   * _isTabAboutPreferencesOrSettings: Is a given tab set to about:preferences or about:settings?
    * @param {Element} aTab A tab element
-   * @returns {bool} Is the linkedBrowser of aElement set to about:preferences?
+   * @returns {bool} Is the linkedBrowser of aElement set to about:preferences or about:settings?
    */
-  _isTabAboutPreferences(aTab) {
-    return aTab.linkedBrowser.currentURI.spec.startsWith("about:preferences");
+  _isTabAboutPreferencesOrSettings(aTab) {
+    return (
+      aTab.linkedBrowser.currentURI.spec.startsWith("about:preferences") ||
+      aTab.linkedBrowser.currentURI.spec.startsWith("about:settings")
+    );
   },
 
   /**
@@ -367,7 +370,7 @@ var gHomePane = {
         "navigator:browser"
     ) {
       tabs = win.gBrowser.visibleTabs.slice(win.gBrowser._numPinnedTabs);
-      tabs = tabs.filter(tab => !this._isTabAboutPreferences(tab));
+      tabs = tabs.filter(tab => !this._isTabAboutPreferencesOrSettings(tab));
       // XXX: Bug 1441637 - Fix tabbrowser to report tab.closing before it blurs it
       tabs = tabs.filter(tab => !tab.closing);
     }

browser/components/preferences/main.js

@@ -278,7 +278,10 @@ var gMainPane = {
         let uri = win.gBrowser.currentURI.spec;
 
         if (
-          (uri == "about:preferences" || uri == "about:preferences#general") &&
+          (uri == "about:preferences" ||
+            uri == "about:preferences#general" ||
+            uri == "about:settings" ||
+            uri == "about:settings#general") &&
           document.visibilityState == "visible"
         ) {
           this.updateSetDefaultBrowser();

dom/security/nsContentSecurityUtils.cpp

@@ -1365,6 +1365,7 @@ void nsContentSecurityUtils::AssertAboutPageHasCSP(Document* aDocument) {
   // preferences and downloads allow legacy inline scripts through hash src.
   MOZ_ASSERT(!foundScriptSrc ||
                  StringBeginsWith(aboutSpec, "about:preferences"_ns) ||
+                 StringBeginsWith(aboutSpec, "about:settings"_ns) ||
                  StringBeginsWith(aboutSpec, "about:downloads"_ns) ||
                  StringBeginsWith(aboutSpec, "about:asrouter"_ns) ||
                  StringBeginsWith(aboutSpec, "about:newtab"_ns) ||
@@ -1383,6 +1384,7 @@ void nsContentSecurityUtils::AssertAboutPageHasCSP(Document* aDocument) {
   // remote web resources
   MOZ_ASSERT(!foundWebScheme ||
                  StringBeginsWith(aboutSpec, "about:preferences"_ns) ||
+                 StringBeginsWith(aboutSpec, "about:settings"_ns) ||
                  StringBeginsWith(aboutSpec, "about:addons"_ns) ||
                  StringBeginsWith(aboutSpec, "about:newtab"_ns) ||
                  StringBeginsWith(aboutSpec, "about:debugging"_ns) ||
@@ -1411,6 +1413,7 @@ void nsContentSecurityUtils::AssertAboutPageHasCSP(Document* aDocument) {
       // Bug 1579160: Remove 'unsafe-inline' from style-src within
       // about:preferences
       "about:preferences"_ns,
+      "about:settings"_ns,
       // Bug 1571346: Remove 'unsafe-inline' from style-src within about:addons
       "about:addons"_ns,
       // Bug 1584485: Remove 'unsafe-inline' from style-src within:
@@ -1553,7 +1556,7 @@ bool nsContentSecurityUtils::ValidateScriptFilename(JSContext* cx,
       // and this is the most reasonable. See 1727770
       u"about:downloads"_ns,
       // We think this is the same problem as about:downloads
-      u"about:preferences"_ns,
+      u"about:preferences"_ns, u"about:settings"_ns,
       // Browser console will give a filename of 'debugger' See 1763943
       // Sometimes it's 'debugger eager eval code', other times just 'debugger
       // eval code'

toolkit/modules/BrowserUtils.sys.mjs

@@ -112,6 +112,7 @@ export var BrowserUtils = {
   canFindInPage(location) {
     return (
       !location.startsWith("about:preferences") &&
+      !location.startsWith("about:settings") &&
       !location.startsWith("about:logins") &&
       !(location.startsWith("about:firefoxview") && lazy.FXVIEW_SEARCH_ENABLED)
     );