From 8dd16259287f58f9273002717ec4d27e97127719 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 12 Jun 2024 07:43:14 +0200 Subject: Merging upstream version 127.0. Signed-off-by: Daniel Baumann --- toolkit/content/aboutLogging.js | 2 +- toolkit/content/aboutNetError.mjs | 3 +- toolkit/content/aboutTelemetry.js | 6 + toolkit/content/customElements.js | 62 +++--- toolkit/content/jar.mn | 2 - toolkit/content/license.html | 5 +- toolkit/content/preferencesBindings.js | 5 + .../content/tests/browser/browser_bug1693577.js | 4 +- toolkit/content/tests/chrome/chrome.toml | 1 - .../tests/chrome/file_editor_with_autocomplete.js | 4 + ...est_autocomplete_with_composition_on_input.html | 2 - .../test_editor_for_input_with_autocomplete.html | 2 - .../content/tests/chrome/window_largemenu.xhtml | 15 +- toolkit/content/tests/widgets/mochitest.toml | 2 + toolkit/content/tests/widgets/test_moz_button.html | 132 +++++++++++-- .../tests/widgets/test_moz_button_group.html | 144 +++++++++----- .../tests/widgets/test_moz_message_bar.html | 28 +-- .../content/tests/widgets/test_moz_page_nav.html | 61 ++++++ .../widgets/test_videocontrols_src_change.html | 56 ++++++ .../widgets/test_videocontrols_video_noaudio.html | 2 +- toolkit/content/widgets.css | 2 +- toolkit/content/widgets/arrowscrollbox.js | 4 +- .../content/widgets/autocomplete-richlistitem.js | 4 +- toolkit/content/widgets/datetimebox.js | 28 +-- toolkit/content/widgets/message-bar.css | 219 --------------------- toolkit/content/widgets/message-bar.js | 91 --------- .../widgets/moz-button-group/moz-button-group.css | 3 +- .../widgets/moz-button-group/moz-button-group.mjs | 25 ++- toolkit/content/widgets/moz-button/moz-button.css | 26 ++- toolkit/content/widgets/moz-button/moz-button.mjs | 21 +- .../widgets/moz-button/moz-button.stories.mjs | 29 +-- .../widgets/moz-message-bar/moz-message-bar.mjs | 12 +- .../content/widgets/moz-page-nav/README.stories.md | 46 ++++- .../widgets/moz-page-nav/moz-page-nav-button.css | 23 ++- .../content/widgets/moz-page-nav/moz-page-nav.mjs | 86 +++++++- .../widgets/moz-page-nav/moz-page-nav.stories.mjs | 32 ++- .../widgets/moz-support-link/moz-support-link.mjs | 6 +- toolkit/content/widgets/notificationbox.js | 3 +- toolkit/content/widgets/panel-list/panel-list.js | 4 - toolkit/content/widgets/popupnotification.js | 2 - toolkit/content/widgets/videocontrols.js | 17 +- toolkit/content/xul.css | 14 -- 42 files changed, 683 insertions(+), 552 deletions(-) create mode 100644 toolkit/content/tests/widgets/test_videocontrols_src_change.html delete mode 100644 toolkit/content/widgets/message-bar.css delete mode 100644 toolkit/content/widgets/message-bar.js (limited to 'toolkit/content') diff --git a/toolkit/content/aboutLogging.js b/toolkit/content/aboutLogging.js index 360ab366e1..f2f4cabc62 100644 --- a/toolkit/content/aboutLogging.js +++ b/toolkit/content/aboutLogging.js @@ -114,7 +114,7 @@ const gLoggingPresets = { }, "media-playback": { modules: - "HTMLMediaElement:4,HTMLMediaElementEvents:4,cubeb:5,PlatformDecoderModule:5,AudioSink:5,AudioSinkWrapper:5,MediaDecoderStateMachine:4,MediaDecoder:4,MediaFormatReader:5,GMP:5", + "HTMLMediaElement:4,HTMLMediaElementEvents:4,cubeb:5,PlatformDecoderModule:5,AudioSink:5,AudioSinkWrapper:5,MediaDecoderStateMachine:4,MediaDecoder:4,MediaFormatReader:5,GMP:5,EME:5", l10nIds: { label: "about-logging-preset-media-playback-label", description: "about-logging-preset-media-playback-description", diff --git a/toolkit/content/aboutNetError.mjs b/toolkit/content/aboutNetError.mjs index 1c733d5dbb..935111dcca 100644 --- a/toolkit/content/aboutNetError.mjs +++ b/toolkit/content/aboutNetError.mjs @@ -396,7 +396,8 @@ function initPage() { }); longDesc = null; - document.getElementById("openInNewWindowContainer").hidden = false; + document.getElementById("openInNewWindowContainer").hidden = + RPMGetBoolPref("security.xfocsp.hideOpenInNewWindow"); const openInNewWindowButton = document.getElementById( "openInNewWindowButton" diff --git a/toolkit/content/aboutTelemetry.js b/toolkit/content/aboutTelemetry.js index 45a8488820..9cf3c3320d 100644 --- a/toolkit/content/aboutTelemetry.js +++ b/toolkit/content/aboutTelemetry.js @@ -352,6 +352,12 @@ var PingPicker = { }, _updateCurrentPingData() { + TelemetryController.ensureInitialized().then(() => + this._doUpdateCurrentPingData() + ); + }, + + _doUpdateCurrentPingData() { const subsession = document.getElementById("show-subsession-data").checked; let ping = TelemetryController.getCurrentPingData(subsession); if (!ping) { diff --git a/toolkit/content/customElements.js b/toolkit/content/customElements.js index ef58963a02..132b069326 100644 --- a/toolkit/content/customElements.js +++ b/toolkit/content/customElements.js @@ -791,7 +791,6 @@ ["button-group", "chrome://global/content/elements/named-deck.js"], ["findbar", "chrome://global/content/elements/findbar.js"], ["menulist", "chrome://global/content/elements/menulist.js"], - ["message-bar", "chrome://global/content/elements/message-bar.js"], ["named-deck", "chrome://global/content/elements/named-deck.js"], ["named-deck-button", "chrome://global/content/elements/named-deck.js"], ["panel-list", "chrome://global/content/elements/panel-list.js"], @@ -806,49 +805,32 @@ "chrome://global/content/elements/autocomplete-input.js", ], ["editor", "chrome://global/content/elements/editor.js"], + ["moz-button", "chrome://global/content/elements/moz-button.mjs"], + [ + "moz-button-group", + "chrome://global/content/elements/moz-button-group.mjs", + ], + ["moz-card", "chrome://global/content/elements/moz-card.mjs"], + ["moz-five-star", "chrome://global/content/elements/moz-five-star.mjs"], + [ + "moz-message-bar", + "chrome://global/content/elements/moz-message-bar.mjs", + ], + ["moz-page-nav", "chrome://global/content/elements/moz-page-nav.mjs"], + [ + "moz-support-link", + "chrome://global/content/elements/moz-support-link.mjs", + ], + ["moz-toggle", "chrome://global/content/elements/moz-toggle.mjs"], ]) { customElements.setElementCreationCallback(tag, () => { - Services.scriptloader.loadSubScript(script, window); + if (script.endsWith(".mjs")) { + ChromeUtils.importESModule(script, { global: "current" }); + } else { + Services.scriptloader.loadSubScript(script, window); + } }); } - // Bug 1813077: This is a workaround until Bug 1803810 lands - // which will give us the ability to load ESMs synchronously - // like the previous Services.scriptloader.loadSubscript() function - function importCustomElementFromESModule(name) { - switch (name) { - case "moz-button": - return import("chrome://global/content/elements/moz-button.mjs"); - case "moz-button-group": - return import( - "chrome://global/content/elements/moz-button-group.mjs" - ); - case "moz-message-bar": - return import("chrome://global/content/elements/moz-message-bar.mjs"); - case "moz-support-link": - return import( - "chrome://global/content/elements/moz-support-link.mjs" - ); - case "moz-toggle": - return import("chrome://global/content/elements/moz-toggle.mjs"); - case "moz-card": - return import("chrome://global/content/elements/moz-card.mjs"); - } - throw new Error(`Unknown custom element name (${name})`); - } - - /* - This function explicitly returns null so that there is no confusion - about which custom elements from ES Modules have been loaded. - */ - window.ensureCustomElements = function (...elementNames) { - return Promise.all( - elementNames - .filter(name => !customElements.get(name)) - .map(name => importCustomElementFromESModule(name)) - ) - .then(() => null) - .catch(console.error); - }; // Immediately load the following elements for (let script of [ diff --git a/toolkit/content/jar.mn b/toolkit/content/jar.mn index d08037a84a..e555936a73 100644 --- a/toolkit/content/jar.mn +++ b/toolkit/content/jar.mn @@ -87,8 +87,6 @@ toolkit.jar: content/global/elements/findbar.js (widgets/findbar.js) content/global/elements/editor.js (widgets/editor.js) content/global/elements/general.js (widgets/general.js) - content/global/elements/message-bar.css (widgets/message-bar.css) - content/global/elements/message-bar.js (widgets/message-bar.js) content/global/elements/menu.js (widgets/menu.js) content/global/elements/menupopup.js (widgets/menupopup.js) content/global/elements/moz-button.css (widgets/moz-button/moz-button.css) diff --git a/toolkit/content/license.html b/toolkit/content/license.html index fe489f74d1..3f05da0118 100644 --- a/toolkit/content/license.html +++ b/toolkit/content/license.html @@ -1495,6 +1495,9 @@ licences. third_party/cups/include
#ifdef MOZ_JXL third_party/highway/
+#endif +#ifdef MOZ_PERFETTO + third_party/perfetto/
#endif

@@ -3600,7 +3603,6 @@ SOFTWARE.
  • devtools/shared/natural-sort.js
  • devtools/shared/node-properties/node-properties.js
  • third_party/rust/ordered-float
    • -
  • third_party/rust/owning_ref
  • third_party/rust/phf, third_party/rust/phf_codegen, third_party/rust/phf_generator, and @@ -3625,6 +3627,7 @@ SOFTWARE.
  • third_party/rust/synstructure
  • third_party/rust/void
  • js/src/zydis (unless otherwise specified)
    • +
  • js/src/vm/Float16.h(the code contained in the half namespace)
    • See the individual LICENSE files or headers for copyright owners.

    diff --git a/toolkit/content/preferencesBindings.js b/toolkit/content/preferencesBindings.js index b2e4070cf5..3dba0bed1e 100644 --- a/toolkit/content/preferencesBindings.js +++ b/toolkit/content/preferencesBindings.js @@ -381,6 +381,11 @@ const Preferences = (window.Preferences = (function () { if (this.locked) { aElement.disabled = true; } + if (aElement.labels?.length) { + for (let label of aElement.labels) { + label.toggleAttribute("disabled", this.locked); + } + } if (!this.isElementEditable(aElement)) { return; diff --git a/toolkit/content/tests/browser/browser_bug1693577.js b/toolkit/content/tests/browser/browser_bug1693577.js index 712749dc89..b85b9f13de 100644 --- a/toolkit/content/tests/browser/browser_bug1693577.js +++ b/toolkit/content/tests/browser/browser_bug1693577.js @@ -12,7 +12,7 @@ add_task(async function test_search_input_popupshowing() { let sidebar = document.getElementById("sidebar"); let loadPromise = BrowserTestUtils.waitForEvent(sidebar, "load", true); - SidebarUI.toggle("viewBookmarksSidebar"); + SidebarController.toggle("viewBookmarksSidebar"); await loadPromise; let inputField = @@ -45,5 +45,5 @@ add_task(async function test_search_input_popupshowing() { popup.hidePopup(); await popuphidden; - SidebarUI.toggle("viewBookmarksSidebar"); + SidebarController.toggle("viewBookmarksSidebar"); }); diff --git a/toolkit/content/tests/chrome/chrome.toml b/toolkit/content/tests/chrome/chrome.toml index 986822ac48..e037f45ecf 100644 --- a/toolkit/content/tests/chrome/chrome.toml +++ b/toolkit/content/tests/chrome/chrome.toml @@ -51,7 +51,6 @@ support-files = [ ] prefs = [ "gfx.font_rendering.fallback.async=false", - "widget.non-native-theme.enabled=false", ] ["test_about_networking.html"] diff --git a/toolkit/content/tests/chrome/file_editor_with_autocomplete.js b/toolkit/content/tests/chrome/file_editor_with_autocomplete.js index acf2c9e9df..0068440785 100644 --- a/toolkit/content/tests/chrome/file_editor_with_autocomplete.js +++ b/toolkit/content/tests/chrome/file_editor_with_autocomplete.js @@ -84,6 +84,10 @@ nsDoTestsForEditorWithAutoComplete.prototype = { Ci.nsIAutoCompleteController.STATUS_COMPLETE_NO_MATCH ); }); + if (test.popup) { + await waitForCondition(() => this._controller.input.popupOpen); + } + this._target.removeEventListener("beforeinput", onBeforeInput); this._target.removeEventListener("input", onInput); this._checkResult(test, beforeInputEvents, inputEvents); diff --git a/toolkit/content/tests/chrome/test_autocomplete_with_composition_on_input.html b/toolkit/content/tests/chrome/test_autocomplete_with_composition_on_input.html index fbcd44e830..fd484a93d1 100644 --- a/toolkit/content/tests/chrome/test_autocomplete_with_composition_on_input.html +++ b/toolkit/content/tests/chrome/test_autocomplete_with_composition_on_input.html @@ -27,7 +27,6 @@ function runTests() { .QueryInterface(Ci.nsIAutoCompleteInput); var originalFormFillTimeout = formFillController.timeout; - SpecialPowers.attachFormFillControllerTo(window); var target = document.getElementById("input"); // Register a word to the form history. @@ -53,7 +52,6 @@ function runTests() { function() { return target.value; }, function() { formFillController.timeout = originalFormFillTimeout; - SpecialPowers.detachFormFillControllerFrom(window); SimpleTest.finish(); }); }); diff --git a/toolkit/content/tests/chrome/test_editor_for_input_with_autocomplete.html b/toolkit/content/tests/chrome/test_editor_for_input_with_autocomplete.html index 91f0f159b4..f2786d47be 100644 --- a/toolkit/content/tests/chrome/test_editor_for_input_with_autocomplete.html +++ b/toolkit/content/tests/chrome/test_editor_for_input_with_autocomplete.html @@ -51,7 +51,6 @@ async function runTests() { .QueryInterface(Ci.nsIAutoCompleteInput); var originalFormFillTimeout = formFillController.timeout; - SpecialPowers.attachFormFillControllerTo(window); var target = document.getElementById("input"); // Register a word to the form history. @@ -71,7 +70,6 @@ async function runTests() { await tests2.run(); formFillController.timeout = originalFormFillTimeout; - SpecialPowers.detachFormFillControllerFrom(window); SimpleTest.finish(); } diff --git a/toolkit/content/tests/chrome/window_largemenu.xhtml b/toolkit/content/tests/chrome/window_largemenu.xhtml index 8e6b6718b4..413ab248bc 100644 --- a/toolkit/content/tests/chrome/window_largemenu.xhtml +++ b/toolkit/content/tests/chrome/window_largemenu.xhtml @@ -336,14 +336,18 @@ function testPopupMovement() var marginTop = parseFloat(getComputedStyle(popup).marginTop); var panelIsTop = SpecialPowers.getBoolPref("ui.panel.default_level_parent"); - var overlapOSChrome = !platformIsMac() && (!isPanelTest || panelIsTop); + var overlapOSChrome = canOverlapOSChrome() && (!isPanelTest || panelIsTop); popup.moveTo(1, 1); [screenX, screenY] = getScreenXY(popup); var expectedx = 1, expectedy = 1; if (!overlapOSChrome) { - if (screen.availLeft >= 1) expectedx = screen.availLeft; - if (screen.availTop >= 1) expectedy = screen.availTop; + if (screen.availLeft >= 1) { + expectedx = screen.availLeft + marginLeft; + } + if (screen.availTop >= 1) { + expectedy = screen.availTop + marginTop; + } } is(screenX, expectedx, gTests[gTestIndex] + " (1, 1) x"); is(screenY, expectedy, gTests[gTestIndex] + " (1, 1) y"); @@ -398,6 +402,11 @@ function platformIsMac() return navigator.platform.indexOf("Mac") > -1; } +function canOverlapOSChrome() +{ + return navigator.platform.startsWith("Win"); +} + window.arguments[0].SimpleTest.waitForFocus(runTests, window); ]]> diff --git a/toolkit/content/tests/widgets/mochitest.toml b/toolkit/content/tests/widgets/mochitest.toml index efd86f1208..f5bc0505bf 100644 --- a/toolkit/content/tests/widgets/mochitest.toml +++ b/toolkit/content/tests/widgets/mochitest.toml @@ -96,6 +96,8 @@ skip-if = [ ["test_videocontrols_size.html"] +["test_videocontrols_src_change.html"] + ["test_videocontrols_standalone.html"] skip-if = [ "os == 'linux'", # bug 1804621 diff --git a/toolkit/content/tests/widgets/test_moz_button.html b/toolkit/content/tests/widgets/test_moz_button.html index a849ccc956..0e64f939dc 100644 --- a/toolkit/content/tests/widgets/test_moz_button.html +++ b/toolkit/content/tests/widgets/test_moz_button.html @@ -17,6 +17,33 @@ } - Test button - - Test button - - - + +
    +
    + Test button + + Test button + + + + + + + +
    + +
    diff --git a/toolkit/content/tests/widgets/test_moz_button_group.html b/toolkit/content/tests/widgets/test_moz_button_group.html index 92fd7776fa..471d554599 100644 --- a/toolkit/content/tests/widgets/test_moz_button_group.html +++ b/toolkit/content/tests/widgets/test_moz_button_group.html @@ -10,6 +10,7 @@ solution for token variables for the new widgets --> +

    @@ -20,6 +21,7 @@ + Test
    @@ -74,54 +76,80 @@ add_setup(async function setup() { ({ html, render} = await import("chrome://global/content/vendor/lit.all.mjs")); document.querySelector("moz-button-group").remove(); + document.querySelector("moz-button").remove(); }); add_task(async function testButtonOrderingSlot() { - render( + let markupOptions = [ html` `, - renderArea - ); + html` + + Primary + Secondary + + `, + ]; + for (let markup of markupOptions) { + render(markup, renderArea); - let buttonGroup = document.querySelector("moz-button-group"); - let primaryButton = document.getElementById("primary-button"); - let secondaryButton = document.getElementById("secondary-button"); + let buttonGroup = document.querySelector("moz-button-group"); + let primaryButton = document.getElementById("primary-button"); + let secondaryButton = document.getElementById("secondary-button"); - buttonGroup.platform = "win"; - await buttonGroup.updateComplete; - await checkButtons(primaryButton, secondaryButton); - buttonGroup.platform = "macosx"; - await buttonGroup.updateComplete; - await checkButtons(secondaryButton, primaryButton); + buttonGroup.platform = "win"; + await buttonGroup.updateComplete; + await checkButtons(primaryButton, secondaryButton); + + buttonGroup.platform = "macosx"; + await buttonGroup.updateComplete; + await checkButtons(secondaryButton, primaryButton); + } }); add_task(async function testPrimaryButtonAutoSlotting() { - render( + let markupOptions = [ html` `, - renderArea - ); - - let buttonGroup = document.querySelector("moz-button-group"); - let primaryButton = buttonGroup.querySelector(".primary"); - let secondaryButton = buttonGroup.querySelector(".secondary"); - buttonGroup.platform = "win"; - await buttonGroup.updateComplete; - is(primaryButton.slot, "primary", "primary button was auto-slotted") - await checkButtons(primaryButton, secondaryButton); - - buttonGroup.platform = "macosx"; - await buttonGroup.updateComplete; - await checkButtons(secondaryButton, primaryButton); + html` + + Primary + Secondary + + `, + html` + + Delete + Secondary + + `, + ]; + for (let markup of markupOptions) { + render(markup, renderArea); + + let buttonGroup = document.querySelector("moz-button-group"); + let primaryButton = buttonGroup.querySelector( + ".primary, [type=primary], [type=destructive]" + ); + let secondaryButton = buttonGroup.querySelector(".secondary, [type=default]"); + buttonGroup.platform = "win"; + await buttonGroup.updateComplete; + is(primaryButton.slot, "primary", "primary button was auto-slotted") + await checkButtons(primaryButton, secondaryButton); + + buttonGroup.platform = "macosx"; + await buttonGroup.updateComplete; + await checkButtons(secondaryButton, primaryButton); + } }); add_task(async function testSubmitButtonAutoSlotting() { @@ -197,38 +225,48 @@ }); add_task(async function testInitialButtonLightDomReordering() { - const renderPlatform = platform => render( - html` + let markupOptions = [ + platform => html` `, - renderArea - ); - - renderPlatform("win"); - let buttonGroup = document.querySelector("moz-button-group"); - await buttonGroup.updateComplete; - let primaryButton = buttonGroup.querySelector(".primary"); - let defaultButton = buttonGroup.querySelector("[default]"); - let secondaryButton = buttonGroup.querySelector(".secondary"); - - is(primaryButton.slot, "primary", "primary button was auto-slotted"); - is(defaultButton.slot, "primary", "default button was auto-slotted"); - await checkButtons(primaryButton, defaultButton, secondaryButton); - - renderPlatform("macosx"); - buttonGroup = document.querySelector("moz-button-group"); - await buttonGroup.updateComplete; - primaryButton = buttonGroup.querySelector(".primary"); - defaultButton = buttonGroup.querySelector("[default]"); - secondaryButton = buttonGroup.querySelector(".secondary"); - - is(primaryButton.slot, "primary", "primary button was auto-slotted"); - is(defaultButton.slot, "primary", "default button was auto-slotted"); - await checkButtons(secondaryButton, primaryButton, defaultButton); + platform => html` + + First + Secondary + Default + + `, + ]; + + for (let markup of markupOptions) { + const renderPlatform = platform => render(markup(platform), renderArea); + + renderPlatform("win"); + let buttonGroup = document.querySelector("moz-button-group"); + await buttonGroup.updateComplete; + let primaryButton = buttonGroup.querySelector(".primary"); + let defaultButton = buttonGroup.querySelector("[default]"); + let secondaryButton = buttonGroup.querySelector(".secondary"); + + is(primaryButton.slot, "primary", "primary button was auto-slotted"); + is(defaultButton.slot, "primary", "default button was auto-slotted"); + await checkButtons(primaryButton, defaultButton, secondaryButton); + + renderPlatform("macosx"); + buttonGroup = document.querySelector("moz-button-group"); + await buttonGroup.updateComplete; + primaryButton = buttonGroup.querySelector(".primary"); + defaultButton = buttonGroup.querySelector("[default]"); + secondaryButton = buttonGroup.querySelector(".secondary"); + + is(primaryButton.slot, "primary", "primary button was auto-slotted"); + is(defaultButton.slot, "primary", "default button was auto-slotted"); + await checkButtons(secondaryButton, primaryButton, defaultButton); + } }); diff --git a/toolkit/content/tests/widgets/test_moz_message_bar.html b/toolkit/content/tests/widgets/test_moz_message_bar.html index 7ee6825ef3..9b48982962 100644 --- a/toolkit/content/tests/widgets/test_moz_message_bar.html +++ b/toolkit/content/tests/widgets/test_moz_message_bar.html @@ -1,27 +1,30 @@ + MozMessageBar tests - + + -

    -
    - - - - - -
    -
    +  
    
+  
    
+    
+    
+    
+    
+    
+  
    
+  
       
 
    
 
+
 
diff --git a/toolkit/content/tests/widgets/test_moz_page_nav.html b/toolkit/content/tests/widgets/test_moz_page_nav.html
index 604df7c024..e03bfa22e2 100644
--- a/toolkit/content/tests/widgets/test_moz_page_nav.html
+++ b/toolkit/content/tests/widgets/test_moz_page_nav.html
@@ -37,6 +37,12 @@ body {
         
           View 5
         
+        
+          Support Link
+        
+        
+          External Link
+        
       
     
   
@@ -120,10 +126,46 @@ function isActiveElement(expectedActiveEl) {
     )
   });
 
+  /**
+  * Tests that footer support links have the expected attributes
+  */
+  add_task(async function test_support_link() {
+    const supportLinkRootPath = "https://support.mozilla.org/";
+    let supportLink = mozPageNav.secondaryNavButtons[0];
+    ok(supportLink.linkEl, "The secondary nav button contains the link element.");
+    ok(
+      supportLink.linkEl.hasAttribute("is") && supportLink.linkEl.getAttribute("is") === "moz-support-link",
+      "The support link has the is=moz-support-link attribute."
+    );
+    ok(
+      supportLink.linkEl.hasAttribute("href") && supportLink.linkEl.getAttribute("href") === `${supportLinkRootPath}test`,
+      "The support link has the expected href atrribute."
+    );
+  });
+
+  /**
+  * Tests that footer external links have the expected attributes
+  */
+  add_task(async function test_external_link() {
+    const externalLinkPath = "https://www.example.com";
+    let externalLink = mozPageNav.secondaryNavButtons[1];
+    ok(externalLink.linkEl, "The secondary nav button contains the link element.");
+    ok(!externalLink.linkEl.hasAttribute("is"), "The external link doesn't have the is=moz-support-link attribute.");
+    ok(
+      externalLink.linkEl.hasAttribute("href") && externalLink.linkEl.getAttribute("href") === externalLinkPath,
+      "The external link has the expected href atrribute."
+    );
+  });
+
   /**
   * Tests that categories are keyboard-navigable
   */
   add_task(async function test_keyboard_navigation() {
+    const tab = async shiftKey => {
+      info(`Tab${shiftKey ? " + Shift" : ""}`);
+      synthesizeKey("KEY_Tab", { shiftKey });
+      await mozPageNav.updateComplete;
+    };
     const arrowDown = async () => {
       info("Arrow down");
       synthesizeKey("KEY_ArrowDown", {});
@@ -155,6 +197,8 @@ function isActiveElement(expectedActiveEl) {
     let thirdPageNavButton = mozPageNav.pageNavButtons[2];
     let fourthPageNavButton = mozPageNav.pageNavButtons[3];
     let fifthPageNavButton = mozPageNav.pageNavButtons[4];
+    let supportLink = mozPageNav.secondaryNavButtons[0];
+    let externalLink = mozPageNav.secondaryNavButtons[1];
 
     is(
       firstPageNavButton.view,
@@ -196,6 +240,23 @@ function isActiveElement(expectedActiveEl) {
       mozPageNav.currentView,
       "The fifth page nav button is still selected"
     )
+    await tab();
+    ok(
+      isActiveElement(supportLink.linkEl),
+      "The support link is selected"
+    )
+    await tab();
+    ok(
+      isActiveElement(externalLink.linkEl),
+      "The external link is selected"
+    )
+    await tab(true);
+    await tab(true);
+    is(
+      fifthPageNavButton.view,
+      mozPageNav.currentView,
+      "The fifth page nav button is selected"
+    )
     await arrowUp();
     is(
       fourthPageNavButton.view,
diff --git a/toolkit/content/tests/widgets/test_videocontrols_src_change.html b/toolkit/content/tests/widgets/test_videocontrols_src_change.html
new file mode 100644
index 0000000000..535b9483cd
--- /dev/null
+++ b/toolkit/content/tests/widgets/test_videocontrols_src_change.html
@@ -0,0 +1,56 @@
+
+
+
+
+
+  Video controls test
+  
+  
+  
+  
+
+
+
+  
    
+
+  
    
+    
+  
    
+
+  
    
+
+  
    +
+
    
+
+
+
diff --git a/toolkit/content/tests/widgets/test_videocontrols_video_noaudio.html b/toolkit/content/tests/widgets/test_videocontrols_video_noaudio.html
index 99d5bdad01..be28ed24c9 100644
--- a/toolkit/content/tests/widgets/test_videocontrols_video_noaudio.html
+++ b/toolkit/content/tests/widgets/test_videocontrols_video_noaudio.html
@@ -29,7 +29,7 @@
   });
 
   add_task(async function mute_button_icon() {
-    is(muteButton.getAttribute("noAudio"), "true");
+    ok(muteButton.hasAttribute("noAudio"), "Mute button should have noAudio attribute");
     ok(muteButton.hasAttribute("disabled"), "Mute button should be disabled");
 
     if (volumeStack) {
diff --git a/toolkit/content/widgets.css b/toolkit/content/widgets.css
index d7f1b68602..16b6d5cb94 100644
--- a/toolkit/content/widgets.css
+++ b/toolkit/content/widgets.css
@@ -22,4 +22,4 @@
 @import url("chrome://global/skin/tabbox.css");
 @import url("chrome://global/skin/toolbar.css");
 @import url("chrome://global/skin/toolbarbutton.css");
-@import url("chrome://global/skin/tree.css");
+@import url("chrome://global/skin/tree/tree.css");
diff --git a/toolkit/content/widgets/arrowscrollbox.js b/toolkit/content/widgets/arrowscrollbox.js
index 7109891faf..5983435d06 100644
--- a/toolkit/content/widgets/arrowscrollbox.js
+++ b/toolkit/content/widgets/arrowscrollbox.js
@@ -21,7 +21,7 @@
       return `
       
       
-      
+      
       
       
         
@@ -29,7 +29,7 @@
         
       
       
-      
+      
     `;
     }
 
diff --git a/toolkit/content/widgets/autocomplete-richlistitem.js b/toolkit/content/widgets/autocomplete-richlistitem.js
index b339ab1e27..0ec8a19243 100644
--- a/toolkit/content/widgets/autocomplete-richlistitem.js
+++ b/toolkit/content/widgets/autocomplete-richlistitem.js
@@ -832,9 +832,7 @@
 
       setTimeout(() => {
         let selectedIndex = popup ? popup.selectedIndex : -1;
-        actor.manager
-          .getActor("FormAutofill")
-          .sendAsyncMessage("FormAutofill:PreviewProfile", { selectedIndex });
+        actor.previewAutofillProfile(selectedIndex);
       }, 0);
     }
 
diff --git a/toolkit/content/widgets/datetimebox.js b/toolkit/content/widgets/datetimebox.js
index 04ed398bd7..1c63b09269 100644
--- a/toolkit/content/widgets/datetimebox.js
+++ b/toolkit/content/widgets/datetimebox.js
@@ -650,6 +650,10 @@ this.DateTimeBoxWidget = class {
   onKeyDown(aEvent) {
     this.log("onKeyDown key: " + aEvent.key);
 
+    if (aEvent.defaultPrevented) {
+      return;
+    }
+
     switch (aEvent.key) {
       // Toggle the picker on Space/Enter on Calendar button or Space on input,
       // close on Escape anywhere.
@@ -691,21 +695,17 @@ this.DateTimeBoxWidget = class {
           aEvent.preventDefault();
           break;
         }
-        if (this.isEditable()) {
-          // TODO(emilio, bug 1571533): These functions should look at
-          // defaultPrevented.
-          // Ctrl+Backspace/Delete on non-macOS and
-          // Cmd+Backspace/Delete on macOS to clear the field
-          if (aEvent.getModifierState("Accel")) {
-            // Clear the input's value
-            this.clearInputFields(false);
-          } else {
-            let targetField = aEvent.originalTarget;
-            this.clearFieldValue(targetField);
-            this.setInputValueFromFields();
-          }
-          aEvent.preventDefault();
+        // Ctrl+Backspace/Delete on non-macOS and
+        // Cmd+Backspace/Delete on macOS to clear the field
+        if (aEvent.getModifierState("Accel")) {
+          // Clear the input's value
+          this.clearInputFields(false);
+        } else {
+          let targetField = aEvent.originalTarget;
+          this.clearFieldValue(targetField);
+          this.setInputValueFromFields();
         }
+        aEvent.preventDefault();
         break;
       }
       case "ArrowRight":
diff --git a/toolkit/content/widgets/message-bar.css b/toolkit/content/widgets/message-bar.css
deleted file mode 100644
index eddc5a3ae6..0000000000
--- a/toolkit/content/widgets/message-bar.css
+++ /dev/null
@@ -1,219 +0,0 @@
-/* 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/. */
-
-:host {
-  --info-icon-url: url("chrome://global/skin/icons/info-filled.svg");
-  --warn-icon-url: url("chrome://global/skin/icons/warning.svg");
-  --success-icon-url: url("chrome://global/skin/icons/check.svg");
-  --error-icon-url: url("chrome://global/skin/icons/error.svg");
-  --close-icon-url: url("chrome://global/skin/icons/close-12.svg");
-  --close-fill-color: var(--in-content-icon-color);
-  --icon-size: 16px;
-  --close-icon-size: 28px;
-}
-
-:host {
-  --message-bar-background-color: var(--in-content-box-info-background);
-  --message-bar-text-color: var(--in-content-text-color);
-  --message-bar-icon-url: var(--info-icon-url);
-  /* The default values of --in-content-button* are sufficient, even for dark themes */
-}
-
-:host([type=warning]) {
-  --message-bar-icon-url: var(--warn-icon-url);
-}
-
-:host([type=success]) {
-  --message-bar-icon-url: var(--success-icon-url);
-}
-
-:host([type=error]),
-:host([type=critical]) {
-  --message-bar-icon-url: var(--error-icon-url);
-}
-
-:host {
-  border: 1px solid transparent;
-  border-radius: 4px;
-}
-
-/* Make the host to behave as a block by default, but allow hidden to hide it. */
-:host(:not([hidden])) {
-  display: block;
-}
-
-::slotted(button) {
-  /* Enforce micro-button width. */
-  min-width: -moz-fit-content !important;
-}
-
-/* MessageBar Grid Layout */
-
-.container {
-  background: var(--message-bar-background-color);
-  color: var(--message-bar-text-color);
-
-  padding: 3px 7px;
-  position: relative;
-
-  border-radius: 4px;
-
-  display: flex;
-  /* Ensure that the message bar shadow dom elements are vertically aligned. */
-  align-items: center;
-}
-
-:host([align="center"]) .container {
-  justify-content: center;
-}
-
-.content {
-  margin: 0 4px;
-  display: inline-block;
-  /* Ensure that the message bar content is vertically aligned. */
-  align-items: center;
-  /* Ensure that the message bar content is wrapped. */
-  word-break: break-word;
-}
-
-/* MessageBar icon style */
-
-.icon {
-  padding: 4px;
-  width: var(--icon-size);
-  height: var(--icon-size);
-  flex-shrink: 0;
-}
-
-.icon::after {
-  display: inline-block;
-  appearance: none;
-  -moz-context-properties: fill, stroke;
-  fill: currentColor;
-  stroke: currentColor;
-  content: "";
-  background-image: var(--message-bar-icon-url);
-  background-size: var(--icon-size);
-  width: var(--icon-size);
-  height: var(--icon-size);
-}
-
-/* Use a spacer to position the close button at the end, but also support
- * centering if required. */
-.spacer {
-  flex-grow: 1;
-}
-
-/* Close icon styles */
-
-:host(:not([dismissable])) .close {
-  display: none;
-}
-
-.close {
-  background-image: var(--close-icon-url);
-  background-repeat: no-repeat;
-  background-position: center center;
-  -moz-context-properties: fill;
-  fill: currentColor;
-  min-width: auto;
-  min-height: auto;
-  width: var(--close-icon-size);
-  height: var(--close-icon-size);
-  padding: 0;
-  flex-shrink: 0;
-  margin: 4px 8px;
-  background-size: 12px;
-}
-
-@media (prefers-contrast) {
-  :host {
-    border-color: CanvasText;
-  }
-}
-
-@media not (prefers-contrast) {
-  /* MessageBar colors by message type */
-  /* Colors from: https://design.firefox.com/photon/components/message-bars.html#type-specific-style */
-
-  :host([type=warning]) {
-    /* Ensure colors within the bar are adjusted and controls are readable */
-    color-scheme: light;
-
-    --message-bar-background-color: var(--yellow-50);
-    --message-bar-text-color: var(--yellow-90);
-
-    --in-content-button-background: var(--yellow-60);
-    --in-content-button-background-hover: var(--yellow-70);
-    --in-content-button-background-active: var(--yellow-80);
-
-    --close-fill-color: var(--message-bar-text-color);
-  }
-
-  :host([type=success]) {
-    /* Ensure colors within the bar are adjusted and controls are readable */
-    color-scheme: light;
-
-    --message-bar-background-color: var(--green-50);
-    --message-bar-text-color: var(--green-90);
-
-    --in-content-button-background: var(--green-60);
-    --in-content-button-background-hover: var(--green-70);
-    --in-content-button-background-active: var(--green-80);
-  }
-
-  :host([type=error]) {
-    --message-bar-background-color: var(--red-60);
-    --message-bar-text-color: #ffffff;
-
-    --in-content-button-background: var(--red-70);
-    --in-content-button-background-hover: var(--red-80);
-    --in-content-button-background-active: var(--red-90);
-  }
-
-  :host([type=info]) .icon {
-    color: rgb(0,144,237);
-  }
-
-  :host([type=warning]) .icon {
-    color: rgb(255,164,54);
-  }
-
-  :host([type=critical]) .icon {
-    color: rgb(226,40,80);
-  }
-
-  .close {
-    fill: var(--close-fill-color);
-  }
-
-  @media (prefers-color-scheme: dark) {
-    /* Don't set the background in prefers-contrast mode or macOS can end up
-     * with black on black text. */
-    :host([type=info]) .icon {
-      color: rgb(128,235,255);
-    }
-
-    :host([type=warning]) .icon {
-      color: rgb(255,189,79);
-    }
-
-    :host([type=critical]) .icon {
-      color: rgb(255,154,162);
-    }
-  }
-}
-
-strong {
-  font-weight: 600;
-}
-
-.text-link:hover {
-  cursor: pointer;
-}
-
-@keyframes spin {
-  from { transform: rotate(0); }
-  to { transform: rotate(360deg); }
-}
diff --git a/toolkit/content/widgets/message-bar.js b/toolkit/content/widgets/message-bar.js
deleted file mode 100644
index d38347b40a..0000000000
--- a/toolkit/content/widgets/message-bar.js
+++ /dev/null
@@ -1,91 +0,0 @@
-/* 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/. */
-
-"use strict";
-
-// This is loaded into chrome windows with the subscript loader. Wrap in
-// a block to prevent accidentally leaking globals onto `window`.
-{
-  class MessageBarElement extends HTMLElement {
-    constructor() {
-      super();
-      const shadowRoot = this.attachShadow({ mode: "open" });
-      window.MozXULElement?.insertFTLIfNeeded(
-        "toolkit/global/notification.ftl"
-      );
-      document.l10n.connectRoot(this.shadowRoot);
-      const content = this.constructor.template.content.cloneNode(true);
-      shadowRoot.append(content);
-      this.closeButton.addEventListener("click", () => this.dismiss(), {
-        once: true,
-      });
-    }
-
-    disconnectedCallback() {
-      this.dispatchEvent(new CustomEvent("message-bar:close"));
-    }
-
-    get closeButton() {
-      return this.shadowRoot.querySelector("button.close");
-    }
-
-    static get template() {
-      const template = document.createElement("template");
-
-      const commonStyles = document.createElement("link");
-      commonStyles.rel = "stylesheet";
-      commonStyles.href = "chrome://global/skin/in-content/common.css";
-      const messageBarStyles = document.createElement("link");
-      messageBarStyles.rel = "stylesheet";
-      messageBarStyles.href =
-        "chrome://global/content/elements/message-bar.css";
-      template.content.append(commonStyles, messageBarStyles);
-
-      // A container for the entire message bar content,
-      // most of the css rules needed to provide the
-      // expected message bar layout is applied on this
-      // element.
-      const container = document.createElement("div");
-      container.part = "container";
-      container.classList.add("container");
-      template.content.append(container);
-
-      const icon = document.createElement("span");
-      icon.classList.add("icon");
-      icon.part = "icon";
-      container.append(icon);
-
-      const barcontent = document.createElement("span");
-      barcontent.classList.add("content");
-      barcontent.append(document.createElement("slot"));
-      container.append(barcontent);
-
-      const spacer = document.createElement("span");
-      spacer.classList.add("spacer");
-      container.append(spacer);
-
-      const closeIcon = document.createElement("button");
-      closeIcon.classList.add("close", "ghost-button");
-      document.l10n.setAttributes(closeIcon, "notification-close-button");
-      container.append(closeIcon);
-
-      Object.defineProperty(this, "template", {
-        value: template,
-      });
-
-      return template;
-    }
-
-    dismiss() {
-      this.dispatchEvent(new CustomEvent("message-bar:user-dismissed"));
-      this.close();
-    }
-
-    close() {
-      this.remove();
-    }
-  }
-
-  customElements.define("message-bar", MessageBarElement);
-}
diff --git a/toolkit/content/widgets/moz-button-group/moz-button-group.css b/toolkit/content/widgets/moz-button-group/moz-button-group.css
index ba79d69e12..5b6f7deace 100644
--- a/toolkit/content/widgets/moz-button-group/moz-button-group.css
+++ b/toolkit/content/widgets/moz-button-group/moz-button-group.css
@@ -11,6 +11,7 @@
   margin: 0 !important;
 }
 
-::slotted(button:not(:first-child, .popup-notification-dropmarker)) {
+::slotted(button:not(:first-child, .popup-notification-dropmarker)),
+::slotted(moz-button:not(:first-child)) {
   margin-inline-start: var(--space-small) !important;
 }
diff --git a/toolkit/content/widgets/moz-button-group/moz-button-group.mjs b/toolkit/content/widgets/moz-button-group/moz-button-group.mjs
index 8bf553c23d..6858367ab7 100644
--- a/toolkit/content/widgets/moz-button-group/moz-button-group.mjs
+++ b/toolkit/content/widgets/moz-button-group/moz-button-group.mjs
@@ -50,15 +50,22 @@ export default class MozButtonGroup extends MozLitElement {
         // Text nodes won't support classList or getAttribute.
         continue;
       }
-      // Bug 1791816: These should check moz-button instead of button.
-      if (
-        child.localName == "button" &&
-        (child.classList.contains("primary") ||
-          child.getAttribute("type") == "submit" ||
-          child.hasAttribute("autofocus") ||
-          child.hasAttribute("default"))
-      ) {
-        child.slot = "primary";
+      switch (child.localName) {
+        case "button":
+          if (
+            child.classList.contains("primary") ||
+            child.getAttribute("type") == "submit" ||
+            child.hasAttribute("autofocus") ||
+            child.hasAttribute("default")
+          ) {
+            child.slot = "primary";
+          }
+          break;
+        case "moz-button":
+          if (child.type == "primary" || child.type == "destructive") {
+            child.slot = "primary";
+          }
+          break;
       }
     }
     this.#reorderLightDom();
diff --git a/toolkit/content/widgets/moz-button/moz-button.css b/toolkit/content/widgets/moz-button/moz-button.css
index 71d57ea93a..4eb6839e06 100644
--- a/toolkit/content/widgets/moz-button/moz-button.css
+++ b/toolkit/content/widgets/moz-button/moz-button.css
@@ -23,6 +23,10 @@ button {
   /* Ensure font-size isn't overridden by widget styling (e.g. in forms.css) */
   font-size: var(--button-font-size);
   width: 100%;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  gap: var(--space-small);
 
   &[size=small] {
     min-height: var(--button-min-height-small);
@@ -125,21 +129,33 @@ button {
     }
   }
 
-  &[type~=icon] {
+  &[type~=icon]:not(.labelled) {
     background-size: var(--icon-size-default);
     background-position: center;
     background-repeat: no-repeat;
-    -moz-context-properties: fill, stroke;
-    fill: currentColor;
-    stroke: currentColor;
+  }
+
+  &[type~=icon]:not(.labelled),
+  &:not(.labelled):has(img) {
     width: var(--button-size-icon);
     height: var(--button-size-icon);
     padding: var(--button-padding-icon);
-    color: var(--icon-color);
 
     &[size=small] {
       width: var(--button-size-icon-small);
       height: var(--button-size-icon-small);
     }
   }
+
+  img,
+  &[type~=icon]:not(.labelled) {
+    -moz-context-properties: fill, fill-opacity, stroke;
+    fill: currentColor;
+    stroke: currentColor;
+  }
+
+  img {
+    width: var(--icon-size-default);
+    height: var(--icon-size-default);
+  }
 }
diff --git a/toolkit/content/widgets/moz-button/moz-button.mjs b/toolkit/content/widgets/moz-button/moz-button.mjs
index a951dbf5d8..9a239d4e56 100644
--- a/toolkit/content/widgets/moz-button/moz-button.mjs
+++ b/toolkit/content/widgets/moz-button/moz-button.mjs
@@ -2,7 +2,7 @@
  * 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/. */
 
-import { html, ifDefined } from "../vendor/lit.all.mjs";
+import { html, ifDefined, classMap } from "../vendor/lit.all.mjs";
 import { MozLitElement } from "../lit-utils.mjs";
 
 /**
@@ -19,8 +19,11 @@ import { MozLitElement } from "../lit-utils.mjs";
  * @property {string} titleAttribute - Internal, map title attribute to the title JS property.
  * @property {string} tooltipText - Set the title property, the title attribute will be used first.
  * @property {string} ariaLabel - The button's arial-label attribute, used in shadow DOM and therefore not as an attribute on moz-button.
+ * @property {string} iconSrc - Path to the icon that should be displayed in the button.
  * @property {string} ariaLabelAttribute - Internal, map aria-label attribute to the ariaLabel JS property.
+ * @property {string} hasVisibleLabel - Internal, tracks whether or not the button has a visible label.
  * @property {HTMLButtonElement} buttonEl - The internal button element in the shadow DOM.
+ * @property {HTMLButtonElement} slotEl - The internal slot element in the shadow DOM.
  * @slot default - The button's content, overrides label property.
  * @fires click - The click event.
  */
@@ -44,10 +47,13 @@ export default class MozButton extends MozLitElement {
       reflect: true,
     },
     ariaLabel: { type: String, state: true },
+    iconSrc: { type: String },
+    hasVisibleLabel: { type: Boolean, state: true },
   };
 
   static queries = {
     buttonEl: "button",
+    slotEl: "slot",
   };
 
   constructor() {
@@ -55,6 +61,7 @@ export default class MozButton extends MozLitElement {
     this.type = "default";
     this.size = "default";
     this.disabled = false;
+    this.hasVisibleLabel = !!this.label;
   }
 
   willUpdate(changes) {
@@ -73,6 +80,12 @@ export default class MozButton extends MozLitElement {
     this.buttonEl.click();
   }
 
+  checkForLabelText() {
+    this.hasVisibleLabel = this.slotEl
+      .assignedNodes()
+      .some(node => node.textContent.trim());
+  }
+
   render() {
     return html`
       
-        ${this.label}
+        ${this.iconSrc
+          ? html``
+          : ""}
+        ${this.label}
       
     `;
   }
diff --git a/toolkit/content/widgets/moz-button/moz-button.stories.mjs b/toolkit/content/widgets/moz-button/moz-button.stories.mjs
index 52a459e807..dd8d6369db 100644
--- a/toolkit/content/widgets/moz-button/moz-button.stories.mjs
+++ b/toolkit/content/widgets/moz-button/moz-button.stories.mjs
@@ -2,7 +2,7 @@
  * 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/. */
 
-import { html } from "../vendor/lit.all.mjs";
+import { html, ifDefined } from "../vendor/lit.all.mjs";
 // eslint-disable-next-line import/no-unassigned-import
 import "./moz-button.mjs";
 
@@ -22,6 +22,10 @@ export default {
       options: ["default", "small"],
       control: { type: "radio" },
     },
+    type: {
+      options: ["default", "primary", "destructive", "icon", "icon ghost"],
+      control: { type: "select" },
+    },
   },
   parameters: {
     actions: {
@@ -40,17 +44,13 @@ moz-button-aria-labelled =
   },
 };
 
-const Template = ({ type, size, l10nId, iconUrl, disabled }) => html`
-  
+const Template = ({ type, size, l10nId, iconSrc, disabled }) => html`
   
 `;
 
@@ -59,7 +59,7 @@ Default.args = {
   type: "default",
   size: "default",
   l10nId: "moz-button-labelled",
-  iconUrl: "chrome://global/skin/icons/more.svg",
+  iconSrc: "",
   disabled: false,
 };
 export const DefaultSmall = Template.bind({});
@@ -67,7 +67,7 @@ DefaultSmall.args = {
   type: "default",
   size: "small",
   l10nId: "moz-button-labelled",
-  iconUrl: "chrome://global/skin/icons/more.svg",
+  iconSrc: "",
   disabled: false,
 };
 export const Primary = Template.bind({});
@@ -85,7 +85,7 @@ Destructive.args = {
 export const Icon = Template.bind({});
 Icon.args = {
   ...Default.args,
-  type: "icon",
+  iconSrc: "chrome://global/skin/icons/more.svg",
   l10nId: "moz-button-titled",
 };
 export const IconSmall = Template.bind({});
@@ -96,5 +96,12 @@ IconSmall.args = {
 export const IconGhost = Template.bind({});
 IconGhost.args = {
   ...Icon.args,
-  type: "icon ghost",
+  type: "ghost",
+};
+export const IconText = Template.bind({});
+IconText.args = {
+  type: "default",
+  size: "default",
+  iconSrc: "chrome://global/skin/icons/edit-copy.svg",
+  l10nId: "moz-button-labelled",
 };
diff --git a/toolkit/content/widgets/moz-message-bar/moz-message-bar.mjs b/toolkit/content/widgets/moz-message-bar/moz-message-bar.mjs
index 8f0c997149..9a186b41c9 100644
--- a/toolkit/content/widgets/moz-message-bar/moz-message-bar.mjs
+++ b/toolkit/content/widgets/moz-message-bar/moz-message-bar.mjs
@@ -49,10 +49,10 @@ const messageTypeToIconData = {
 
 export default class MozMessageBar extends MozLitElement {
   static queries = {
-    actionsSlotEl: "slot[name=actions]",
+    actionsSlot: "slot[name=actions]",
     actionsEl: ".actions",
-    closeButtonEl: "moz-button.close",
-    supportLinkSlotEl: "slot[name=support-link]",
+    closeButton: "moz-button.close",
+    supportLinkSlot: "slot[name=support-link]",
   };
 
   static properties = {
@@ -72,13 +72,13 @@ export default class MozMessageBar extends MozLitElement {
   }
 
   onSlotchange() {
-    let actions = this.actionsSlotEl.assignedNodes();
+    let actions = this.actionsSlot.assignedNodes();
     this.actionsEl.classList.toggle("active", actions.length);
   }
 
   connectedCallback() {
     super.connectedCallback();
-    this.setAttribute("role", "status");
+    this.setAttribute("role", "alert");
   }
 
   disconnectedCallback() {
@@ -87,7 +87,7 @@ export default class MozMessageBar extends MozLitElement {
   }
 
   get supportLinkEls() {
-    return this.supportLinkSlotEl.assignedElements();
+    return this.supportLinkSlot.assignedElements();
   }
 
   iconTemplate() {
diff --git a/toolkit/content/widgets/moz-page-nav/README.stories.md b/toolkit/content/widgets/moz-page-nav/README.stories.md
index 800d446478..c2f1b37bb5 100644
--- a/toolkit/content/widgets/moz-page-nav/README.stories.md
+++ b/toolkit/content/widgets/moz-page-nav/README.stories.md
@@ -4,7 +4,7 @@
 intended to change the selected view, provide a heading, and have links to external resources.
 
 ```html story
-
+
   
     
    Test 3
    
       
+  
+    
    Support Link
    
+      
+  
+   
    External Link
    
+      
     
 ```
 
 ## When to use
 
 * Use moz-page-nav for single-page navigation to switch between different views.
-* moz-page-nav will also support footer buttons for external support links in the future (See [bug 1877826](https://bugzilla.mozilla.org/show_bug.cgi?id=1877826))
+* moz-page-nav also supports footer buttons for external and support links
 * This component will be used in about: pages such as about:firefoxview, about:preferences, about:addons, about:debugging, etc.
 
 ## When not to use
@@ -53,18 +67,34 @@ And used as follows:
 
 ```html
 
-    
-    
-    
+  
-    
-    
+  
-    
+  
+
+  
+
+  
+  
+  
+
+  
+  
+  
 
 ```
 
diff --git a/toolkit/content/widgets/moz-page-nav/moz-page-nav-button.css b/toolkit/content/widgets/moz-page-nav/moz-page-nav-button.css
index 5d00198d65..781398056a 100644
--- a/toolkit/content/widgets/moz-page-nav/moz-page-nav-button.css
+++ b/toolkit/content/widgets/moz-page-nav/moz-page-nav-button.css
@@ -4,11 +4,13 @@
 
 :host {
   border-radius: var(--border-radius-small);
+  font-size: var(--font-size-large);
   &:focus-visible {
     outline-offset: var(--page-nav-focus-outline-inset);
   }
 }
 
+a[href],
 button {
   background-color: var(--page-nav-button-background-color);
   border: 1px solid var(--page-nav-border-color);
@@ -28,11 +30,17 @@ button {
   padding: var(--page-nav-button-padding);
 }
 
+a[href] {
+  text-decoration: none;
+  box-sizing: border-box;
+}
+
 button:hover {
   cursor: pointer;
 }
 
 @media not (prefers-contrast) {
+  a[href],
   button {
     position: relative;
   }
@@ -55,6 +63,7 @@ button:hover {
     background-color: var(--icon-color);
   }
 
+  a[href]:hover,
   button:hover,
   button[selected]:hover {
     background-color: var(--page-nav-button-background-color-hover);
@@ -72,6 +81,7 @@ button:hover {
   }
 }
 
+a[href]:focus-visible,
 button:focus-visible,
 button[selected]:focus-visible {
   outline: var(--focus-outline);
@@ -86,13 +96,24 @@ button[selected]:focus-visible {
   fill: currentColor;
 }
 
+:host(.secondary-nav-item) {
+  font-size: var(--font-size-small);
+
+  & .page-nav-icon {
+    height: var(--icon-size-default);
+    width: var(--icon-size-default);
+  }
+}
+
 @media (prefers-contrast) {
+  a[href],
   button {
     transition: none;
     border-color: ButtonText;
     background-color: var(--button-background-color);
   }
 
+  a[href]:hover,
   button:hover {
     color: SelectedItem;
   }
@@ -105,13 +126,13 @@ button[selected]:focus-visible {
 }
 
 slot {
-  font-size: var(--font-size-large);
   margin: 0;
   padding-inline-start: 0;
   user-select: none;
 }
 
 @media (max-width: 52rem) {
+  a[href],
   button {
     grid-template-columns: min-content;
     justify-content: center;
diff --git a/toolkit/content/widgets/moz-page-nav/moz-page-nav.mjs b/toolkit/content/widgets/moz-page-nav/moz-page-nav.mjs
index f998ee735f..c720e76e26 100644
--- a/toolkit/content/widgets/moz-page-nav/moz-page-nav.mjs
+++ b/toolkit/content/widgets/moz-page-nav/moz-page-nav.mjs
@@ -4,6 +4,8 @@
 
 import { html } from "chrome://global/content/vendor/lit.all.mjs";
 import { MozLitElement } from "chrome://global/content/lit-utils.mjs";
+// eslint-disable-next-line import/no-unassigned-import
+import "chrome://global/content/elements/moz-support-link.mjs";
 
 /**
  * A grouping of navigation buttons that is displayed at the page level,
@@ -35,6 +37,14 @@ export default class MozPageNav extends MozLitElement {
       );
   }
 
+  get secondaryNavButtons() {
+    return this.secondaryNavGroupSlot
+      .assignedNodes()
+      .filter(
+        node => node?.localName === "moz-page-nav-button" && !node.hidden
+      );
+  }
+
   onChangeView(e) {
     this.currentView = e.target.view;
   }
@@ -69,6 +79,12 @@ export default class MozPageNav extends MozLitElement {
     }
   }
 
+  onSecondaryNavChange() {
+    this.secondaryNavGroupSlot.assignedElements()?.forEach(el => {
+      el.classList.add("secondary-nav-item");
+    });
+  }
+
   render() {
     return html`
       
         
         
    
-          
+          
         
    
       
     `;
@@ -114,16 +133,18 @@ customElements.define("moz-page-nav", MozPageNav);
  * A navigation button intended to change the selected view within a page.
  *
  * @tagname moz-page-nav-button
+ * @property {string} href - (optional) The url for an external link if not a support page URL
  * @property {string} iconSrc - The chrome:// url for the icon used for the button.
- * @property {string} l10nId - The fluent ID for the button's text
  * @property {boolean} selected - Whether or not the button is currently selected.
+ * @property {string} supportPage - (optional) The short name for the support page a secondary link should launch to
  * @slot [default] - Used to append the l10n string to the button.
  */
 export class MozPageNavButton extends MozLitElement {
   static properties = {
     iconSrc: { type: String },
-    l10nId: { type: String },
+    href: { type: String },
     selected: { type: Boolean },
+    supportPage: { type: String, attribute: "support-page" },
   };
 
   connectedCallback() {
@@ -133,6 +154,7 @@ export class MozPageNavButton extends MozLitElement {
 
   static queries = {
     buttonEl: "button",
+    linkEl: "a",
   };
 
   get view() {
@@ -148,12 +170,15 @@ export class MozPageNavButton extends MozLitElement {
     );
   }
 
-  render() {
+  itemTemplate() {
+    if (this.href || this.supportPage) {
+      return this.linkTemplate();
+    }
+    return this.buttonTemplate();
+  }
+
+  buttonTemplate() {
     return html`
-      
       
     `;
   }
+
+  linkTemplate() {
+    if (this.supportPage) {
+      return html`
+        
+          ${this.innerContentTemplate()}
+        
+      `;
+    }
+    return html`
+      
+        ${this.innerContentTemplate()}
+      
+    `;
+  }
+
+  innerContentTemplate() {
+    return html`
+      ${this.iconSrc
+        ? html``
+        : ""}
+      
+    `;
+  }
+
+  render() {
+    return html`
+      
+      ${this.itemTemplate()}
+    `;
+  }
 }
 customElements.define("moz-page-nav-button", MozPageNavButton);
diff --git a/toolkit/content/widgets/moz-page-nav/moz-page-nav.stories.mjs b/toolkit/content/widgets/moz-page-nav/moz-page-nav.stories.mjs
index 4ac7b455cf..d1c565efe9 100644
--- a/toolkit/content/widgets/moz-page-nav/moz-page-nav.stories.mjs
+++ b/toolkit/content/widgets/moz-page-nav/moz-page-nav.stories.mjs
@@ -2,7 +2,7 @@
  * 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/. */
 
-import { html } from "../vendor/lit.all.mjs";
+import { html, when } from "../vendor/lit.all.mjs";
 // eslint-disable-next-line import/no-unassigned-import
 import "./moz-page-nav.mjs";
 
@@ -21,15 +21,17 @@ moz-page-nav-button-two = View 2
   .title = View 2
 moz-page-nav-button-three = View 3
   .title = View 3
-moz-page-link-one = Support Page
-  .title = Support Page
+moz-page-nav-button-four = Support Link
+  .title = Support Link
+moz-page-nav-button-five = External Link
+  .title = External Link
 moz-page-nav-heading =
   .heading = Heading
      `,
   },
 };
 
-const Template = () => html`
+const Template = ({ hasFooterLinks }) => html`