Merging upstream version 127.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

29 files changed, 1068 insertions, 277 deletions

diff --git a/browser/components/extensions/test/browser/browser.toml b/browser/components/extensions/test/browser/browser.toml
index 570a51eeb4..b5b4322ffe 100644
--- a/browser/components/extensions/test/browser/browser.toml
+++ b/browser/components/extensions/test/browser/browser.toml
@@ -392,6 +392,8 @@ run-if = ["crashreporter"]
 
 ["browser_ext_request_permissions.js"]
 
+["browser_ext_runtime_getContexts.js"]
+
 ["browser_ext_runtime_onPerformanceWarning.js"]
 
 ["browser_ext_runtime_openOptionsPage.js"]
diff --git a/browser/components/extensions/test/browser/browser_ext_browserAction_contextMenu.js b/browser/components/extensions/test/browser/browser_ext_browserAction_contextMenu.js
index 26d1536de1..32de8b95f2 100644
--- a/browser/components/extensions/test/browser/browser_ext_browserAction_contextMenu.js
+++ b/browser/components/extensions/test/browser/browser_ext_browserAction_contextMenu.js
@@ -2,10 +2,6 @@
 /* vim: set sts=2 sw=2 et tw=80: */
 "use strict";
 
-ChromeUtils.defineESModuleGetters(this, {
-  AbuseReporter: "resource://gre/modules/AbuseReporter.sys.mjs",
-});
-
 XPCOMUtils.defineLazyPreferenceGetter(
   this,
   "ABUSE_REPORT_ENABLED",
@@ -546,35 +542,6 @@ async function browseraction_contextmenu_report_extension_helper() {
     useAddonManager: "temporary",
   });
 
-  async function testReportDialog(viaUnifiedContextMenu) {
-    const reportDialogWindow = await BrowserTestUtils.waitForCondition(
-      () => AbuseReporter.getOpenDialog(),
-      "Wait for the abuse report dialog to have been opened"
-    );
-
-    const reportDialogParams = reportDialogWindow.arguments[0].wrappedJSObject;
-    is(
-      reportDialogParams.report.addon.id,
-      id,
-      "Abuse report dialog has the expected addon id"
-    );
-    is(
-      reportDialogParams.report.reportEntryPoint,
-      viaUnifiedContextMenu ? "unified_context_menu" : "toolbar_context_menu",
-      "Abuse report dialog has the expected reportEntryPoint"
-    );
-
-    info("Wait the report dialog to complete rendering");
-    await reportDialogParams.promiseReportPanel;
-    info("Close the report dialog");
-    reportDialogWindow.close();
-    is(
-      await reportDialogParams.promiseReport,
-      undefined,
-      "Report resolved as user cancelled when the window is closed"
-    );
-  }
-
   async function testContextMenu(menuId, customizing) {
     info(`Open browserAction context menu in ${menuId}`);
     let menu = await openContextMenu(menuId, buttonId);
@@ -591,54 +558,27 @@ async function browseraction_contextmenu_report_extension_helper() {
 
     let aboutAddonsBrowser;
 
-    if (AbuseReporter.amoFormEnabled) {
-      const reportURL = Services.urlFormatter
-        .formatURLPref("extensions.abuseReport.amoFormURL")
-        .replace("%addonID%", id);
-
-      const promiseReportTab = BrowserTestUtils.waitForNewTab(
-        gBrowser,
-        reportURL,
-        /* waitForLoad */ false,
-        // Expect it to be the next tab opened
-        /* waitForAnyTab */ false
-      );
-      await closeChromeContextMenu(menuId, reportExtension);
-      const reportTab = await promiseReportTab;
-      // Remove the report tab and expect the selected tab
-      // to become the about:addons tab.
-      BrowserTestUtils.removeTab(reportTab);
-      is(
-        gBrowser.selectedBrowser.currentURI.spec,
-        "about:blank",
-        "Expect about:addons tab to not have been opened (amoFormEnabled=true)"
-      );
-    } else {
-      // When running in customizing mode "about:addons" will load in a new tab,
-      // otherwise it will replace the existing blank tab.
-      const onceAboutAddonsTab = customizing
-        ? BrowserTestUtils.waitForNewTab(gBrowser, "about:addons")
-        : BrowserTestUtils.waitForCondition(() => {
-            return gBrowser.currentURI.spec === "about:addons";
-          }, "Wait an about:addons tab to be opened");
-      await closeChromeContextMenu(menuId, reportExtension);
-      await onceAboutAddonsTab;
-      const browser = gBrowser.selectedBrowser;
-      is(
-        browser.currentURI.spec,
-        "about:addons",
-        "Got about:addons tab selected (amoFormEnabled=false)"
-      );
-      // Do not wait for the about:addons tab to be loaded if its
-      // document is already readyState==complete.
-      // This prevents intermittent timeout failures while running
-      // this test in optimized builds.
-      if (browser.contentDocument?.readyState != "complete") {
-        await BrowserTestUtils.browserLoaded(browser);
-      }
-      await testReportDialog(usingUnifiedContextMenu);
-      aboutAddonsBrowser = browser;
-    }
+    const reportURL = Services.urlFormatter
+      .formatURLPref("extensions.abuseReport.amoFormURL")
+      .replace("%addonID%", id);
+
+    const promiseReportTab = BrowserTestUtils.waitForNewTab(
+      gBrowser,
+      reportURL,
+      /* waitForLoad */ false,
+      // Expect it to be the next tab opened
+      /* waitForAnyTab */ false
+    );
+    await closeChromeContextMenu(menuId, reportExtension);
+    const reportTab = await promiseReportTab;
+    // Remove the report tab and expect the selected tab
+    // to become the about:addons tab.
+    BrowserTestUtils.removeTab(reportTab);
+    is(
+      gBrowser.selectedBrowser.currentURI.spec,
+      "about:blank",
+      "Expect about:addons tab to not have been opened"
+    );
 
     // Close the new about:addons tab when running in customize mode,
     // or cancel the abuse report if the about:addons page has been
@@ -729,22 +669,7 @@ add_task(async function test_unified_extensions_ui() {
   await browseraction_contextmenu_manage_extension_helper();
   await browseraction_contextmenu_remove_extension_helper();
   await test_no_toolbar_pinning_on_builtin_helper();
-});
-
-add_task(async function test_report_amoFormEnabled() {
-  await SpecialPowers.pushPrefEnv({
-    set: [["extensions.abuseReport.amoFormEnabled", true]],
-  });
-  await browseraction_contextmenu_report_extension_helper();
-  await SpecialPowers.popPrefEnv();
-});
-
-add_task(async function test_report_amoFormDisabled() {
-  await SpecialPowers.pushPrefEnv({
-    set: [["extensions.abuseReport.amoFormEnabled", false]],
-  });
   await browseraction_contextmenu_report_extension_helper();
-  await SpecialPowers.popPrefEnv();
 });
 
 /**
diff --git a/browser/components/extensions/test/browser/browser_ext_commands_execute_browser_action.js b/browser/components/extensions/test/browser/browser_ext_commands_execute_browser_action.js
index 526dfbbeeb..9ca2a9c666 100644
--- a/browser/components/extensions/test/browser/browser_ext_commands_execute_browser_action.js
+++ b/browser/components/extensions/test/browser/browser_ext_commands_execute_browser_action.js
@@ -2,10 +2,9 @@
 /* vim: set sts=2 sw=2 et tw=80: */
 "use strict";
 
-add_task(async function testTabSwitchActionContext() {
-  await SpecialPowers.pushPrefEnv({
-    set: [["extensions.manifestV3.enabled", true]],
-  });
+ChromeUtils.defineESModuleGetters(this, {
+  ExtensionSettingsStore:
+    "resource://gre/modules/ExtensionSettingsStore.sys.mjs",
 });
 
 async function testExecuteBrowserActionWithOptions(options = {}) {
@@ -192,3 +191,232 @@ add_task(
     });
   }
 );
+
+add_task(async function test_fallback_to_execute_browser_action_in_mv3() {
+  // Make sure the mouse isn't hovering over the browserAction widget.
+  EventUtils.synthesizeMouseAtCenter(
+    gURLBar.textbox,
+    { type: "mouseover" },
+    window
+  );
+
+  const EXTENSION_ID = "@test-action";
+  const extMV2 = ExtensionTestUtils.loadExtension({
+    manifest: {
+      manifest_version: 2,
+      browser_action: {},
+      browser_specific_settings: { gecko: { id: EXTENSION_ID } },
+      commands: {
+        _execute_browser_action: {
+          suggested_key: {
+            default: "Alt+1",
+          },
+        },
+      },
+    },
+    async background() {
+      await browser.commands.update({
+        name: "_execute_browser_action",
+        shortcut: "Alt+Shift+2",
+      });
+      browser.test.sendMessage("command-update");
+    },
+    useAddonManager: "temporary",
+  });
+  await extMV2.startup();
+  await extMV2.awaitMessage("command-update");
+
+  let storedCommands = ExtensionSettingsStore.getAllForExtension(
+    EXTENSION_ID,
+    "commands"
+  );
+  Assert.deepEqual(
+    storedCommands,
+    ["_execute_browser_action"],
+    "expected a stored command"
+  );
+
+  const extDataMV3 = {
+    manifest: {
+      manifest_version: 3,
+      action: {},
+      browser_specific_settings: { gecko: { id: EXTENSION_ID } },
+      commands: {
+        _execute_action: {
+          suggested_key: {
+            default: "Alt+3",
+          },
+        },
+      },
+    },
+    background() {
+      browser.action.onClicked.addListener(() => {
+        browser.test.notifyPass("execute-action-on-clicked-fired");
+      });
+
+      browser.test.onMessage.addListener(async (msg, data) => {
+        switch (msg) {
+          case "verify": {
+            const commands = await browser.commands.getAll();
+            browser.test.assertDeepEq(
+              data,
+              commands,
+              "expected correct commands"
+            );
+            browser.test.sendMessage(`${msg}-done`);
+            break;
+          }
+
+          case "update":
+            await browser.commands.update(data);
+            browser.test.sendMessage(`${msg}-done`);
+            break;
+
+          case "reset":
+            await browser.commands.reset("_execute_action");
+            browser.test.sendMessage(`${msg}-done`);
+            break;
+
+          default:
+            browser.test.fail(`unexpected message: ${msg}`);
+        }
+      });
+
+      browser.test.sendMessage("ready");
+    },
+    useAddonManager: "temporary",
+  };
+  const extMV3 = ExtensionTestUtils.loadExtension(extDataMV3);
+  await extMV3.startup();
+  await extMV3.awaitMessage("ready");
+
+  // We should have the shortcut value from the previous extension.
+  extMV3.sendMessage("verify", [
+    {
+      name: "_execute_action",
+      description: null,
+      shortcut: "Alt+Shift+2",
+    },
+  ]);
+  await extMV3.awaitMessage("verify-done");
+
+  // Execute the shortcut from the MV2 extension.
+  await SimpleTest.promiseFocus(window);
+  EventUtils.synthesizeKey("2", {
+    altKey: true,
+    shiftKey: true,
+  });
+  await extMV3.awaitFinish("execute-action-on-clicked-fired");
+
+  // Update the shortcut.
+  extMV3.sendMessage("update", {
+    name: "_execute_action",
+    shortcut: "Alt+Shift+4",
+  });
+  await extMV3.awaitMessage("update-done");
+
+  extMV3.sendMessage("verify", [
+    {
+      name: "_execute_action",
+      description: null,
+      shortcut: "Alt+Shift+4",
+    },
+  ]);
+  await extMV3.awaitMessage("verify-done");
+
+  // At this point, we should have the old and new commands in storage.
+  storedCommands = ExtensionSettingsStore.getAllForExtension(
+    EXTENSION_ID,
+    "commands"
+  );
+  Assert.deepEqual(
+    storedCommands,
+    ["_execute_browser_action", "_execute_action"],
+    "expected two stored commands"
+  );
+
+  // Disarm any pending writes before we modify the JSONFile directly.
+  await ExtensionSettingsStore._reloadFile(
+    true // saveChanges
+  );
+
+  let jsonFileName = "extension-settings.json";
+  let storePath = PathUtils.join(PathUtils.profileDir, jsonFileName);
+
+  let settingsStoreData = await IOUtils.readJSON(storePath);
+  Assert.deepEqual(
+    Array.from(Object.keys(settingsStoreData.commands)),
+    ["_execute_browser_action", "_execute_action"],
+    "expected command hortcuts data to be found in extension-settings.json"
+  );
+
+  // Reverse the order of _execute_action and _execute_browser_action stored
+  // in the settings store.
+  settingsStoreData.commands = {
+    _execute_action: settingsStoreData.commands._execute_action,
+    _execute_browser_action: settingsStoreData.commands._execute_browser_action,
+  };
+
+  Assert.deepEqual(
+    Array.from(Object.keys(settingsStoreData.commands)),
+    ["_execute_action", "_execute_browser_action"],
+    "expected command shortcuts order to be reversed in extension-settings.json data"
+  );
+
+  // Write the extension-settings.json data and reload it.
+  await IOUtils.writeJSON(storePath, settingsStoreData);
+  await ExtensionSettingsStore._reloadFile(
+    false // saveChanges
+  );
+
+  // Restart the extension to verify that the loaded command is the right one.
+  const updatedExtMV3 = ExtensionTestUtils.loadExtension(extDataMV3);
+  await updatedExtMV3.startup();
+  await updatedExtMV3.awaitMessage("ready");
+
+  // We should *still* have two stored commands.
+  storedCommands = ExtensionSettingsStore.getAllForExtension(
+    EXTENSION_ID,
+    "commands"
+  );
+  Assert.deepEqual(
+    storedCommands,
+    ["_execute_action", "_execute_browser_action"],
+    "expected two stored commands"
+  );
+
+  updatedExtMV3.sendMessage("verify", [
+    {
+      name: "_execute_action",
+      description: null,
+      shortcut: "Alt+Shift+4",
+    },
+  ]);
+  await updatedExtMV3.awaitMessage("verify-done");
+
+  updatedExtMV3.sendMessage("reset");
+  await updatedExtMV3.awaitMessage("reset-done");
+
+  // Resetting the shortcut should take the default value from the latest
+  // extension version.
+  updatedExtMV3.sendMessage("verify", [
+    {
+      name: "_execute_action",
+      description: null,
+      shortcut: "Alt+3",
+    },
+  ]);
+  await updatedExtMV3.awaitMessage("verify-done");
+
+  // At this point, we should no longer have any stored commands, since we are
+  // using the default.
+  storedCommands = ExtensionSettingsStore.getAllForExtension(
+    EXTENSION_ID,
+    "commands"
+  );
+  Assert.deepEqual(storedCommands, [], "expected no stored command");
+
+  await extMV2.unload();
+  await extMV3.unload();
+  await updatedExtMV3.unload();
+});
diff --git a/browser/components/extensions/test/browser/browser_ext_commands_update.js b/browser/components/extensions/test/browser/browser_ext_commands_update.js
index 5e1f05e346..9598328d26 100644
--- a/browser/components/extensions/test/browser/browser_ext_commands_update.js
+++ b/browser/components/extensions/test/browser/browser_ext_commands_update.js
@@ -401,11 +401,11 @@ add_task(async function updateSidebarCommand() {
   await extension.awaitMessage("sidebar");
 
   // Show and hide the switcher panel to generate the initial shortcuts.
-  let switcherShown = promisePopupShown(SidebarUI._switcherPanel);
-  SidebarUI.showSwitcherPanel();
+  let switcherShown = promisePopupShown(SidebarController._switcherPanel);
+  SidebarController.showSwitcherPanel();
   await switcherShown;
-  let switcherHidden = promisePopupHidden(SidebarUI._switcherPanel);
-  SidebarUI.hideSwitcherPanel();
+  let switcherHidden = promisePopupHidden(SidebarController._switcherPanel);
+  SidebarController.hideSwitcherPanel();
   await switcherHidden;
 
   let menuitemId = `sidebarswitcher_menu_${makeWidgetId(
diff --git a/browser/components/extensions/test/browser/browser_ext_contextMenus.js b/browser/components/extensions/test/browser/browser_ext_contextMenus.js
index 77e4bf0827..0ed5d6ce9e 100644
--- a/browser/components/extensions/test/browser/browser_ext_contextMenus.js
+++ b/browser/components/extensions/test/browser/browser_ext_contextMenus.js
@@ -724,7 +724,7 @@ add_task(async function test_bookmark_sidebar_contextmenu() {
     await extension.startup();
     let bookmarkGuid = await extension.awaitMessage("bookmark-created");
 
-    let sidebar = window.SidebarUI.browser;
+    let sidebar = window.SidebarController.browser;
     let menu = sidebar.contentDocument.getElementById("placesContext");
     tree.selectItems([bookmarkGuid]);
     let shown = BrowserTestUtils.waitForEvent(menu, "popupshown");
diff --git a/browser/components/extensions/test/browser/browser_ext_contextMenus_bookmarks.js b/browser/components/extensions/test/browser/browser_ext_contextMenus_bookmarks.js
index 24411731f7..3c0a1269a9 100644
--- a/browser/components/extensions/test/browser/browser_ext_contextMenus_bookmarks.js
+++ b/browser/components/extensions/test/browser/browser_ext_contextMenus_bookmarks.js
@@ -54,7 +54,7 @@ add_task(async function test_bookmark_sidebar_contextmenu() {
       expectedVirtualID,
     ] of expected_bookmarkID_2_virtualID) {
       info(`Testing context menu for Bookmark ID "${expectedBookmarkID}"`);
-      let sidebar = window.SidebarUI.browser;
+      let sidebar = window.SidebarController.browser;
       let menu = sidebar.contentDocument.getElementById("placesContext");
       tree.selectItems([expectedBookmarkID]);
 
diff --git a/browser/components/extensions/test/browser/browser_ext_contextMenus_targetUrlPatterns.js b/browser/components/extensions/test/browser/browser_ext_contextMenus_targetUrlPatterns.js
index 0f353600d7..ae1ec31827 100644
--- a/browser/components/extensions/test/browser/browser_ext_contextMenus_targetUrlPatterns.js
+++ b/browser/components/extensions/test/browser/browser_ext_contextMenus_targetUrlPatterns.js
@@ -221,7 +221,7 @@ add_task(async function privileged_are_allowed_to_use_restrictedSchemes() {
     manifest: {
       permissions: ["tabs", "contextMenus", "mozillaAddons"],
     },
-    async background() {
+    background() {
       browser.contextMenus.create({
         id: "privileged-extension",
         title: "Privileged Extension",
@@ -229,6 +229,7 @@ add_task(async function privileged_are_allowed_to_use_restrictedSchemes() {
         documentUrlPatterns: ["about:reader*"],
       });
 
+      let articleReady = Promise.withResolvers();
       browser.tabs.onUpdated.addListener(async (tabId, changeInfo, tab) => {
         if (
           changeInfo.status === "complete" &&
@@ -236,6 +237,9 @@ add_task(async function privileged_are_allowed_to_use_restrictedSchemes() {
         ) {
           browser.test.sendMessage("readerModeEntered");
         }
+        if (tab.isArticle && tab.url.includes("/readerModeArticle.html")) {
+          articleReady.resolve();
+        }
       });
 
       browser.test.onMessage.addListener(async msg => {
@@ -244,8 +248,20 @@ add_task(async function privileged_are_allowed_to_use_restrictedSchemes() {
           return;
         }
 
+        browser.test.log("Waiting for tab.isArticle to be true");
+        await articleReady.promise;
+        browser.test.log("Toggling reader mode");
         browser.tabs.toggleReaderMode();
       });
+
+      browser.tabs.query(
+        { url: "*://example.com/*/readerModeArticle.html" },
+        tabs => {
+          if (tabs[0].isArticle) {
+            articleReady.resolve();
+          }
+        }
+      );
     },
   });
 
diff --git a/browser/components/extensions/test/browser/browser_ext_getViews.js b/browser/components/extensions/test/browser/browser_ext_getViews.js
index 1af190e753..20db9c86c8 100644
--- a/browser/components/extensions/test/browser/browser_ext_getViews.js
+++ b/browser/components/extensions/test/browser/browser_ext_getViews.js
@@ -78,44 +78,6 @@ function genericChecker() {
   browser.test.sendMessage(kind + "-ready");
 }
 
-async function promiseBrowserContentUnloaded(browser) {
-  // Wait until the content has unloaded before resuming the test, to avoid
-  // calling extension.getViews too early (and having intermittent failures).
-  const MSG_WINDOW_DESTROYED = "Test:BrowserContentDestroyed";
-  let unloadPromise = new Promise(resolve => {
-    Services.ppmm.addMessageListener(MSG_WINDOW_DESTROYED, function listener() {
-      Services.ppmm.removeMessageListener(MSG_WINDOW_DESTROYED, listener);
-      resolve();
-    });
-  });
-
-  await ContentTask.spawn(
-    browser,
-    MSG_WINDOW_DESTROYED,
-    MSG_WINDOW_DESTROYED => {
-      let innerWindowId = this.content.windowGlobalChild.innerWindowId;
-      let observer = subject => {
-        if (
-          innerWindowId === subject.QueryInterface(Ci.nsISupportsPRUint64).data
-        ) {
-          Services.obs.removeObserver(observer, "inner-window-destroyed");
-
-          // Use process message manager to ensure that the message is delivered
-          // even after the <browser>'s message manager is disconnected.
-          Services.cpmm.sendAsyncMessage(MSG_WINDOW_DESTROYED);
-        }
-      };
-      // Observe inner-window-destroyed, like ExtensionPageChild, to ensure that
-      // the ExtensionPageContextChild instance has been unloaded when we resolve
-      // the unloadPromise.
-      Services.obs.addObserver(observer, "inner-window-destroyed");
-    }
-  );
-
-  // Return an object so that callers can use "await".
-  return { unloadPromise };
-}
-
 add_task(async function () {
   let win1 = await BrowserTestUtils.openNewBrowserWindow();
   let win2 = await BrowserTestUtils.openNewBrowserWindow();
diff --git a/browser/components/extensions/test/browser/browser_ext_menus_replace_menu_permissions.js b/browser/components/extensions/test/browser/browser_ext_menus_replace_menu_permissions.js
index c9627c5ae9..7960dd74dc 100644
--- a/browser/components/extensions/test/browser/browser_ext_menus_replace_menu_permissions.js
+++ b/browser/components/extensions/test/browser/browser_ext_menus_replace_menu_permissions.js
@@ -189,7 +189,9 @@ add_task(async function overrideContext_permissions() {
 
   // permissions.request requires user input, export helper.
   await SpecialPowers.spawn(
-    SidebarUI.browser.contentDocument.getElementById("webext-panels-browser"),
+    SidebarController.browser.contentDocument.getElementById(
+      "webext-panels-browser"
+    ),
     [],
     () => {
       const { ExtensionCommon } = ChromeUtils.importESModule(
@@ -212,7 +214,9 @@ add_task(async function overrideContext_permissions() {
     await BrowserTestUtils.synthesizeMouseAtCenter(
       "a",
       { type: "contextmenu" },
-      SidebarUI.browser.contentDocument.getElementById("webext-panels-browser")
+      SidebarController.browser.contentDocument.getElementById(
+        "webext-panels-browser"
+      )
     );
   } while (await extension.awaitMessage("continue_test"));
 
diff --git a/browser/components/extensions/test/browser/browser_ext_menus_targetElement.js b/browser/components/extensions/test/browser/browser_ext_menus_targetElement.js
index 4fc9ebba82..9035b6eecb 100644
--- a/browser/components/extensions/test/browser/browser_ext_menus_targetElement.js
+++ b/browser/components/extensions/test/browser/browser_ext_menus_targetElement.js
@@ -308,6 +308,14 @@ add_task(async function independentMenusInDifferentTabs() {
   gBrowser.selectedTab = tab2;
 
   let targetElementId2 = await extension.openAndCloseMenu("#editabletext");
+  if (targetElementId === targetElementId2) {
+    // targetElementId is only guaranteed to be unique within a tab, so odds are
+    // that by unlucky coincidence, that the discovered ID accidentally overlaps
+    // with the actual ID.
+    info(`Got same targetElementId ${targetElementId}, retrying for a new one`);
+    targetElementId2 = await extension.openAndCloseMenu("#editabletext");
+  }
+  Assert.notEqual(targetElementId, targetElementId2, "targetElementId differ");
 
   await extension.checkIsValid(
     targetElementId2,
diff --git a/browser/components/extensions/test/browser/browser_ext_mousewheel_zoom.js b/browser/components/extensions/test/browser/browser_ext_mousewheel_zoom.js
index 9c5f447a76..1c9224ca00 100644
--- a/browser/components/extensions/test/browser/browser_ext_mousewheel_zoom.js
+++ b/browser/components/extensions/test/browser/browser_ext_mousewheel_zoom.js
@@ -120,7 +120,7 @@ async function test_mousewheel_zoom(test) {
     const sidebar = document.getElementById("sidebar-box");
     ok(!sidebar.hidden, "Sidebar box is visible");
 
-    browser = SidebarUI.browser.contentWindow.gBrowser.selectedBrowser;
+    browser = SidebarController.browser.contentWindow.gBrowser.selectedBrowser;
   } else if (test == TESTS.BROWSER_ACTION) {
     browser = await openBrowserActionPanel(extension, undefined, true);
   } else if (test == TESTS.PAGE_ACTION) {
diff --git a/browser/components/extensions/test/browser/browser_ext_openPanel.js b/browser/components/extensions/test/browser/browser_ext_openPanel.js
index ed96bf2520..c56c0a31b6 100644
--- a/browser/components/extensions/test/browser/browser_ext_openPanel.js
+++ b/browser/components/extensions/test/browser/browser_ext_openPanel.js
@@ -136,16 +136,16 @@ add_task(async function test_openPopup_requires_user_interaction() {
     {},
     gBrowser.selectedBrowser
   );
-  await TestUtils.waitForCondition(() => !SidebarUI.isOpen);
+  await TestUtils.waitForCondition(() => !SidebarController.isOpen);
 
   await click("#toggleSidebarAction");
-  await TestUtils.waitForCondition(() => SidebarUI.isOpen);
+  await TestUtils.waitForCondition(() => SidebarController.isOpen);
   await BrowserTestUtils.synthesizeMouseAtCenter(
     "#toggleSidebarAction",
     {},
     gBrowser.selectedBrowser
   );
-  await TestUtils.waitForCondition(() => !SidebarUI.isOpen);
+  await TestUtils.waitForCondition(() => !SidebarController.isOpen);
 
   BrowserTestUtils.removeTab(gBrowser.selectedTab);
   await extension.unload();
diff --git a/browser/components/extensions/test/browser/browser_ext_originControls.js b/browser/components/extensions/test/browser/browser_ext_originControls.js
index 176eef08bc..6bcae3ef8f 100644
--- a/browser/components/extensions/test/browser/browser_ext_originControls.js
+++ b/browser/components/extensions/test/browser/browser_ext_originControls.js
@@ -20,6 +20,12 @@ const l10n = new Localization(
   true
 );
 
+add_setup(async function setup() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["extensions.originControls.grantByDefault", false]],
+  });
+});
+
 async function makeExtension({
   useAddonManager = "temporary",
   manifest_version = 3,
diff --git a/browser/components/extensions/test/browser/browser_ext_pageAction_show_matches.js b/browser/components/extensions/test/browser/browser_ext_pageAction_show_matches.js
index fd589acdbd..71f13a4691 100644
--- a/browser/components/extensions/test/browser/browser_ext_pageAction_show_matches.js
+++ b/browser/components/extensions/test/browser/browser_ext_pageAction_show_matches.js
@@ -268,10 +268,14 @@ add_task(async function test_pageAction_restrictScheme_false() {
       },
     },
     background: function () {
-      browser.tabs.onUpdated.addListener(async (tabId, changeInfo) => {
+      let articleReady = Promise.withResolvers();
+      browser.tabs.onUpdated.addListener(async (tabId, changeInfo, tab) => {
         if (changeInfo.url && changeInfo.url.startsWith("about:reader")) {
           browser.test.sendMessage("readerModeEntered");
         }
+        if (tab.isArticle && tab.url.includes("/readerModeArticle.html")) {
+          articleReady.resolve();
+        }
       });
 
       browser.test.onMessage.addListener(async msg => {
@@ -280,8 +284,20 @@ add_task(async function test_pageAction_restrictScheme_false() {
           return;
         }
 
+        browser.test.log("Waiting for tab.isArticle to be true");
+        await articleReady.promise;
+        browser.test.log("Toggling reader mode");
         browser.tabs.toggleReaderMode();
       });
+
+      browser.tabs.query(
+        { url: "*://example.com/*/readerModeArticle.html" },
+        tabs => {
+          if (tabs[0].isArticle) {
+            articleReady.resolve();
+          }
+        }
+      );
     },
   });
 
diff --git a/browser/components/extensions/test/browser/browser_ext_popup_select_in_oopif.js b/browser/components/extensions/test/browser/browser_ext_popup_select_in_oopif.js
index fa2c414047..bdc5145dc5 100644
--- a/browser/components/extensions/test/browser/browser_ext_popup_select_in_oopif.js
+++ b/browser/components/extensions/test/browser/browser_ext_popup_select_in_oopif.js
@@ -70,6 +70,8 @@ add_task(async function testPopupSelectPopup() {
   });
 
   const selectRect = await SpecialPowers.spawn(iframe, [], async () => {
+    await SpecialPowers.contentTransformsReceived(content.window);
+
     await ContentTaskUtils.waitForCondition(() => {
       return content.document.querySelector("select");
     });
diff --git a/browser/components/extensions/test/browser/browser_ext_runtime_getContexts.js b/browser/components/extensions/test/browser/browser_ext_runtime_getContexts.js
new file mode 100644
index 0000000000..4d28cd5f87
--- /dev/null
+++ b/browser/components/extensions/test/browser/browser_ext_runtime_getContexts.js
@@ -0,0 +1,597 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+loadTestSubscript("head_devtools.js");
+
+async function genericChecker() {
+  const params = new URLSearchParams(window.location.search);
+  const kind = params.get("kind");
+
+  browser.test.onMessage.addListener(async (msg, ...args) => {
+    if (msg == `${kind}-get-contexts-invalid-params`) {
+      browser.test.assertThrows(
+        () => browser.runtime.getContexts({ unknownParamName: true }),
+        /Type error for parameter filter \(Unexpected property "unknownParamName"\)/,
+        "Got the expected error on unexpected filter property"
+      );
+      browser.test.sendMessage(`${msg}:done`);
+    } else if (msg == `${kind}-get-contexts`) {
+      const filter = args[0];
+      try {
+        const result = await browser.runtime.getContexts(filter);
+        browser.test.sendMessage(`${msg}:result`, result);
+      } catch (err) {
+        // In case of unexpected errors, log a failure and let the test
+        // to continue to avoid it to only fail after timing out.
+        browser.test.fail(`browser.runtime.getContexts call rejected: ${err}`);
+        browser.test.sendMessage(`${msg}:result`, []);
+      }
+    } else if (msg == `${kind}-history-push-state`) {
+      const pushStateURL = args[0];
+      window.history.pushState({}, "", pushStateURL);
+      browser.test.sendMessage(`${msg}:done`);
+    } else if (msg == `${kind}-create-iframe`) {
+      const iframeUrl = args[0];
+      const iframe = document.createElement("iframe");
+      iframe.src = iframeUrl;
+      document.body.appendChild(iframe);
+    } else if (msg == `${kind}-open-options-page`) {
+      browser.runtime.openOptionsPage();
+    }
+  });
+
+  if (kind === "devtools-page") {
+    await browser.devtools.panels.create(
+      "Test DevTool Panel",
+      "fake-icon.png",
+      "page.html?kind=devtools-panel"
+    );
+  }
+
+  browser.test.log(`${kind} extension page loaded`);
+  browser.test.sendMessage(`${kind}-loaded`);
+}
+
+async function triggerActionPopup(extension, win, callback) {
+  // Window needs focus to open popups.
+  await focusWindow(win);
+  await clickBrowserAction(extension, win);
+  let browser = await awaitExtensionPanel(extension, win);
+
+  await callback();
+
+  let { unloadPromise } = await promiseBrowserContentUnloaded(browser);
+  closeBrowserAction(extension, win);
+  await unloadPromise;
+}
+
+const byWindowId = (a, b) => a.windowId - b.windowId;
+const byTabId = (a, b) => a.tabId - b.tabId;
+const byFrameId = (a, b) => a.frameId - b.frameId;
+const byContextType = (a, b) => a.contextType.localeCompare(b.contextType);
+
+const assertValidContextId = contextId => {
+  Assert.equal(
+    typeof contextId,
+    "string",
+    "contextId should be set to a string"
+  );
+  Assert.notEqual(
+    contextId.length,
+    0,
+    "contextId should be set to a non-zero length string"
+  );
+};
+
+const assertGetContextsResult = (
+  actual,
+  expected,
+  msg,
+  { assertContextId = false } = {}
+) => {
+  const actualCopy = assertContextId ? actual : actual.map(it => ({ ...it }));
+  if (!assertContextId) {
+    actualCopy.forEach(it => delete it.contextId);
+  }
+  for (let [idx, expectedProps] of expected.entries()) {
+    Assert.deepEqual(actualCopy[idx], expectedProps, msg);
+  }
+  Assert.equal(
+    actualCopy.length,
+    expected.length,
+    "Got the expected number of extension contexts"
+  );
+};
+
+add_task(async function test_runtime_getContexts() {
+  const EXT_ID = "runtime-getContexts@mochitest";
+  let extension = ExtensionTestUtils.loadExtension({
+    useAddonManager: "temporary", // To automatically show sidebar on load.
+    incognitoOverride: "spanning",
+    manifest: {
+      manifest_version: 3,
+      browser_specific_settings: { gecko: { id: EXT_ID } },
+
+      action: {
+        default_popup: "page.html?kind=action",
+        default_area: "navbar",
+      },
+
+      sidebar_action: {
+        default_panel: "page.html?kind=sidebar",
+      },
+
+      options_ui: {
+        page: "page.html?kind=options",
+      },
+
+      devtools_page: "page.html?kind=devtools-page",
+
+      background: {
+        page: "page.html?kind=background",
+      },
+    },
+
+    files: {
+      "page.html": `
+      <!DOCTYPE html>
+      <html>
+      <head><meta charset="utf-8"></head>
+      <body>
+      <script src="page.js"></script>
+      </body></html>
+      `,
+
+      "page.js": genericChecker,
+    },
+  });
+
+  const {
+    Management: {
+      global: { tabTracker, windowTracker },
+    },
+  } = ChromeUtils.importESModule("resource://gre/modules/Extension.sys.mjs");
+
+  let firstWin = window;
+  let secondWin = await BrowserTestUtils.openNewBrowserWindow();
+  let privateWin = await BrowserTestUtils.openNewBrowserWindow({
+    private: true,
+  });
+
+  await extension.startup();
+  await extension.awaitMessage("background-loaded");
+
+  // Expect 3 sidebars (2 non-private and 1 private windows).
+  await extension.awaitMessage("sidebar-loaded");
+  await extension.awaitMessage("sidebar-loaded");
+  await extension.awaitMessage("sidebar-loaded");
+
+  let firstWinId = windowTracker.getId(firstWin);
+  let secondWinId = windowTracker.getId(secondWin);
+  let privateWinId = windowTracker.getId(privateWin);
+
+  const getGetContextsResults = async ({ filter, sortBy }) => {
+    extension.sendMessage("background-get-contexts", filter);
+    let results = await extension.awaitMessage(
+      "background-get-contexts:result"
+    );
+    if (sortBy) {
+      results.sort(sortBy);
+    }
+    return results;
+  };
+
+  const resolveExtPageUrl = urlPath =>
+    WebExtensionPolicy.getByID(EXT_ID).extension.baseURI.resolve(urlPath);
+
+  const documentOrigin = resolveExtPageUrl("/").slice(0, -1);
+
+  const getExpectedExtensionContext = ({
+    contextId,
+    contextType,
+    documentUrl,
+    incognito = false,
+    frameId = 0,
+    tabId = -1,
+    windowId = -1,
+  }) => {
+    let props = {
+      contextType,
+      documentOrigin,
+      documentUrl,
+      incognito,
+      frameId,
+      tabId,
+      windowId,
+    };
+    if (contextId) {
+      props.contextId = contextId;
+    }
+    return props;
+  };
+
+  let expected = [
+    getExpectedExtensionContext({
+      contextType: "BACKGROUND",
+      documentUrl: resolveExtPageUrl("page.html?kind=background"),
+    }),
+
+    getExpectedExtensionContext({
+      contextType: "SIDE_PANEL",
+      documentUrl: resolveExtPageUrl("page.html?kind=sidebar"),
+      windowId: firstWinId,
+    }),
+
+    getExpectedExtensionContext({
+      contextType: "SIDE_PANEL",
+      documentUrl: resolveExtPageUrl("page.html?kind=sidebar"),
+      windowId: secondWinId,
+    }),
+
+    getExpectedExtensionContext({
+      contextType: "SIDE_PANEL",
+      documentUrl: resolveExtPageUrl("page.html?kind=sidebar"),
+      windowId: privateWinId,
+      incognito: true,
+    }),
+  ].sort(byWindowId);
+
+  info("Test getContexts error on unsupported getContexts filter property");
+  extension.sendMessage("background-get-contexts-invalid-params");
+  await extension.awaitMessage("background-get-contexts-invalid-params:done");
+
+  info("Test getContexts with a valid empty filter");
+  let actual = await getGetContextsResults({ filter: {}, sortBy: byWindowId });
+
+  assertGetContextsResult(
+    actual,
+    expected,
+    "Got the expected results from runtime.getContexts (with an empty filter)"
+  );
+
+  for (const ctx of actual) {
+    info(`Validate contextId for context ${ctx.contextType} ${ctx.contextId}`);
+    assertValidContextId(ctx.contextId);
+  }
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser: secondWin.gBrowser,
+      url: resolveExtPageUrl("page.html?kind=tab"),
+    },
+    async browser => {
+      info("Wait the extension page to be fully loaded in the new tab");
+      await extension.awaitMessage("tab-loaded");
+
+      const tabId = tabTracker.getBrowserData(browser).tabId;
+
+      const expectedTabContext = getExpectedExtensionContext({
+        contextType: "TAB",
+        documentUrl: resolveExtPageUrl("page.html?kind=tab"),
+        windowId: secondWinId,
+        tabId,
+        incognito: false,
+      });
+
+      info("Test getContexts with contextTypes TAB filter");
+      let actual = await getGetContextsResults({
+        filter: { contextTypes: ["TAB"] },
+      });
+      assertGetContextsResult(
+        actual,
+        [expectedTabContext],
+        "Got the expected results from runtime.getContexts (with contextTypes TAB filter)"
+      );
+      assertValidContextId(actual[0].contextId);
+      const initialTabContextId = actual[0].contextId;
+
+      info("Test getContexts with contextTypes TabIds filter");
+      actual = await getGetContextsResults({
+        filter: { tabIds: [tabId] },
+      });
+      assertGetContextsResult(
+        actual,
+        [expectedTabContext],
+        "Got the expected results from runtime.getContexts (with tabIds filter)"
+      );
+
+      info("Test getContexts with contextTypes WindowIds filter");
+      actual = await getGetContextsResults({
+        filter: { windowIds: [secondWinId] },
+        sortBy: byTabId,
+      });
+      assertGetContextsResult(
+        actual,
+        [
+          expectedTabContext,
+          expected.find(it => it.windowId === secondWinId),
+        ].sort(byTabId),
+        "Got the expected results from runtime.getContexts (with windowIds filter)"
+      );
+
+      info("Test getContexts after navigating the tab");
+      const newTabURL = resolveExtPageUrl("page.html?kind=tab&navigated=true");
+      browser.loadURI(Services.io.newURI(newTabURL), {
+        triggeringPrincipal:
+          Services.scriptSecurityManager.getSystemPrincipal(),
+      });
+      await extension.awaitMessage("tab-loaded");
+
+      actual = await getGetContextsResults({
+        filter: {
+          contextTypes: ["TAB"],
+          windowIds: [secondWinId],
+        },
+      });
+      Assert.equal(actual.length, 1, "Expect 1 tab extension context");
+      Assert.equal(
+        actual[0].documentUrl,
+        newTabURL,
+        "Expect documentUrl to match the new loaded url"
+      );
+      Assert.equal(actual[0].frameId, 0, "Got expected frameId");
+      Assert.equal(
+        actual[0].tabId,
+        expectedTabContext.tabId,
+        "Got expected tabId"
+      );
+      Assert.notEqual(
+        actual[0].contextId,
+        initialTabContextId,
+        "Expect contextId to change on navigated tab"
+      );
+    }
+  );
+
+  await triggerActionPopup(extension, privateWin, async () => {
+    info("Wait the extension page to be fully loaded in the action popup");
+    await extension.awaitMessage("action-loaded");
+
+    const expectedPopupContext = getExpectedExtensionContext({
+      contextType: "POPUP",
+      documentUrl: resolveExtPageUrl("page.html?kind=action"),
+      windowId: privateWinId,
+      tabId: -1,
+      incognito: true,
+    });
+
+    info("Test getContexts with contextTypes POPUP filter");
+    let actual = await getGetContextsResults({
+      filter: {
+        contextTypes: ["POPUP"],
+      },
+    });
+    assertGetContextsResult(
+      actual,
+      [expectedPopupContext],
+      "Got the expected results from runtime.getContexts (with contextTypes POPUP filter)"
+    );
+
+    info("Test getContexts with incognito true filter");
+    actual = await getGetContextsResults({
+      filter: { incognito: true },
+      sortBy: byContextType,
+    });
+    assertGetContextsResult(
+      actual.sort(byContextType),
+      [expectedPopupContext, ...expected.filter(it => it.incognito)].sort(
+        byContextType
+      ),
+      "Got the expected results from runtime.getContexts (with contextTypes incognito true filter)"
+    );
+  });
+
+  info("Test getContexts with existing background iframes");
+  extension.sendMessage(
+    `background-create-iframe`,
+    resolveExtPageUrl("page.html?kind=background-subframe")
+  );
+  await extension.awaitMessage(`background-subframe-loaded`);
+
+  actual = await getGetContextsResults({
+    filter: { contextTypes: ["BACKGROUND"] },
+  });
+
+  Assert.equal(
+    actual.length,
+    2,
+    "Expect 2 background extension contexts to be found"
+  );
+  const bgTopFrame = actual.find(
+    it => it.documentUrl === resolveExtPageUrl("page.html?kind=background")
+  );
+  const bgSubFrame = actual.find(
+    it =>
+      it.documentUrl === resolveExtPageUrl("page.html?kind=background-subframe")
+  );
+
+  assertValidContextId(bgTopFrame.contextId);
+  assertValidContextId(bgSubFrame.contextId);
+  Assert.notEqual(
+    bgTopFrame.contextId,
+    bgSubFrame.contextId,
+    "Expect background top and sub frame to have different contextIds"
+  );
+
+  Assert.equal(
+    bgTopFrame.frameId,
+    0,
+    "Expect background top frame to have frameId 0"
+  );
+  ok(
+    typeof bgSubFrame.frameId === "number" && bgSubFrame.frameId > 0,
+    "Expect background sub frame to have a non zero frameId"
+  );
+  Assert.equal(
+    bgSubFrame.windowId,
+    bgSubFrame.windowId,
+    "Expect background top frame to have same windowId as the top frame"
+  );
+  Assert.equal(
+    bgSubFrame.tabId,
+    bgTopFrame.tabId,
+    "Expect background top frame to have same tabId as the top frame"
+  );
+
+  info("Test getContexts with existing sidebars iframes");
+  extension.sendMessage(
+    `sidebar-create-iframe`,
+    resolveExtPageUrl("page.html?kind=sidebar-subframe")
+  );
+  // Expect 3 sidebar subframe to be created.
+  await extension.awaitMessage(`sidebar-subframe-loaded`);
+  await extension.awaitMessage(`sidebar-subframe-loaded`);
+  await extension.awaitMessage(`sidebar-subframe-loaded`);
+
+  actual = await getGetContextsResults({
+    filter: { contextTypes: ["SIDE_PANEL"], windowIds: [firstWinId] },
+    sortBy: byFrameId,
+  });
+  Assert.equal(
+    actual.length,
+    2,
+    "Expect 2 sidebar extension contexts to be found for the first window"
+  );
+  // NOTE: we have already asserted that the sidebar top level frame has frameId 0.
+  Assert.greater(
+    actual.find(
+      it =>
+        it.documentUrl == resolveExtPageUrl("page.html?kind=sidebar-subframe")
+    )?.frameId,
+    0,
+    "Expect sidebar subframe to have the expected frameId"
+  );
+  // NOTE: we have already asserted that the top level frame have tabId -1.
+  Assert.equal(
+    actual[0].tabId,
+    actual[1].tabId,
+    "Expect iframe and top level sidebar frame to have the same tabId"
+  );
+
+  actual = await getGetContextsResults({
+    filter: { contextTypes: ["SIDE_PANEL"], windowIds: [secondWinId] },
+    sortBy: byFrameId,
+  });
+  Assert.equal(
+    actual.length,
+    2,
+    "Expect 2 sidebar extension contexts to be found for the second window"
+  );
+
+  actual = await getGetContextsResults({
+    filter: { contextTypes: ["SIDE_PANEL"], incognito: true },
+  });
+  Assert.equal(
+    actual.length,
+    2,
+    "Expect 2 sidebar extension contexts to be found for private windows"
+  );
+
+  info("Test getContexts after background history push state");
+  let pushStateURLPath = "/page.html?kind=background&pushedState=1";
+  extension.sendMessage("background-history-push-state", pushStateURLPath);
+  await extension.awaitMessage("background-history-push-state:done");
+
+  actual = await getGetContextsResults({
+    filter: { contextTypes: ["BACKGROUND"], frameIds: [0] },
+  });
+  Assert.equal(
+    actual.length,
+    1,
+    "Expect 1 top level background context to be found"
+  );
+  Assert.equal(
+    actual[0].contextId,
+    bgTopFrame.contextId,
+    "Expect top level background contextId to NOT be changed"
+  );
+  Assert.equal(
+    actual[0].documentUrl,
+    resolveExtPageUrl(pushStateURLPath),
+    "Expect top level background documentUrl to change due to history.pushState"
+  );
+
+  await BrowserTestUtils.closeWindow(privateWin);
+  await BrowserTestUtils.closeWindow(secondWin);
+
+  info(
+    "Test getContexts after opening an options page embedded in an about:addons tab"
+  );
+  await BrowserTestUtils.withNewTab("about:addons", async () => {
+    extension.sendMessage("background-open-options-page");
+    await extension.awaitMessage("options-loaded");
+    const { selectedBrowser } = firstWin.gBrowser;
+    Assert.equal(
+      selectedBrowser.currentURI.spec,
+      "about:addons",
+      "Expect an about:addons tab to be current active tab"
+    );
+    let optionsTabId = tabTracker.getBrowserData(selectedBrowser).tabId;
+
+    actual = await getGetContextsResults({
+      filter: { windowIds: [firstWinId], tabIds: [optionsTabId] },
+    });
+    assertGetContextsResult(
+      actual,
+      [
+        getExpectedExtensionContext({
+          contextType: "TAB",
+          documentUrl: resolveExtPageUrl("page.html?kind=options"),
+          windowId: firstWinId,
+          tabId: optionsTabId,
+        }),
+      ],
+      "Got the expected results from runtime.getContexts for an options_page"
+    );
+  });
+
+  info("Test getContexts with an extension devtools page and devtools panel");
+  await BrowserTestUtils.withNewTab("https://example.com", async () => {
+    const tab = gBrowser.selectedTab;
+    const toolbox = await openToolboxForTab(tab);
+
+    info("Wait for the devtools page to be loaded");
+    await extension.awaitMessage("devtools-page-loaded");
+
+    Assert.equal(
+      toolbox.getAdditionalTools()?.length,
+      1,
+      "Expecte extension devtools panel to be registered"
+    );
+    let panelId = toolbox.getAdditionalTools()[0].id;
+    await gDevTools.showToolboxForTab(tab, { toolId: panelId });
+
+    info("Wait for the devtools panel to be loaded");
+    await extension.awaitMessage("devtools-panel-loaded");
+
+    actual = await getGetContextsResults({ filter: {} });
+    // Expect the backgrond page and its subframe to still be returned.
+    Assert.equal(
+      actual.filter(ctx => ctx.contextType === "BACKGROUND").length,
+      2,
+      "Expect the existing 2 background context types"
+    );
+    // Expect the side_panel page and its subframe to still be returned.
+    Assert.equal(
+      actual.filter(ctx => ctx.contextType === "SIDE_PANEL").length,
+      2,
+      "Expect the existing 2 side_panel context types"
+    );
+    // Expect no other context to be listed in the getContexts results
+    // (devtools page and panel are currently expected to not be
+    // part of getContexts results).
+    Assert.deepEqual(
+      actual.filter(
+        ctx => !["BACKGROUND", "SIDE_PANEL"].includes(ctx.contextType)
+      ),
+      [],
+      "DevTools page and panel are not listed in getContexts results"
+    );
+
+    await closeToolboxForTab(gBrowser.selectedTab);
+  });
+
+  await extension.unload();
+});
diff --git a/browser/components/extensions/test/browser/browser_ext_sessions_getRecentlyClosed.js b/browser/components/extensions/test/browser/browser_ext_sessions_getRecentlyClosed.js
index 7dd41ecfe9..715cf14458 100644
--- a/browser/components/extensions/test/browser/browser_ext_sessions_getRecentlyClosed.js
+++ b/browser/components/extensions/test/browser/browser_ext_sessions_getRecentlyClosed.js
@@ -7,7 +7,7 @@ requestLongerTimeout(2);
 loadTestSubscript("head_sessions.js");
 
 add_task(async function test_sessions_get_recently_closed() {
-  async function openAndCloseWindow(url = "http://example.com", tabUrls) {
+  async function openAndCloseWindow(url = "https://example.com", tabUrls) {
     let win = await BrowserTestUtils.openNewBrowserWindow();
     BrowserTestUtils.startLoadingURIString(win.gBrowser.selectedBrowser, url);
     await BrowserTestUtils.browserLoaded(win.gBrowser.selectedBrowser);
@@ -77,13 +77,13 @@ add_task(async function test_sessions_get_recently_closed() {
 
   let tab = await BrowserTestUtils.openNewForegroundTab(
     gBrowser,
-    "http://example.com"
+    "https://example.com"
   );
   BrowserTestUtils.removeTab(tab);
 
   tab = await BrowserTestUtils.openNewForegroundTab(
     gBrowser,
-    "http://example.com"
+    "https://example.com"
   );
   BrowserTestUtils.removeTab(tab);
 
@@ -123,7 +123,7 @@ add_task(async function test_sessions_get_recently_closed_navigated() {
       .then(recentlyClosed => {
         let tab = recentlyClosed[0].window.tabs[0];
         browser.test.assertEq(
-          "http://example.com/",
+          "https://example.com/",
           tab.url,
           "Tab in closed window has the expected url."
         );
@@ -144,7 +144,7 @@ add_task(async function test_sessions_get_recently_closed_navigated() {
 
   // Test with a window with navigation history.
   let win = await BrowserTestUtils.openNewBrowserWindow();
-  for (let url of ["about:robots", "about:mozilla", "http://example.com/"]) {
+  for (let url of ["about:robots", "about:mozilla", "https://example.com/"]) {
     BrowserTestUtils.startLoadingURIString(win.gBrowser.selectedBrowser, url);
     await BrowserTestUtils.browserLoaded(win.gBrowser.selectedBrowser);
   }
@@ -178,7 +178,7 @@ add_task(
             "The second tab with empty.xpi has no url field due to empty history."
           );
           browser.test.assertEq(
-            "http://example.com/",
+            "https://example.com/",
             win.tabs[2].url,
             "The third tab is example.com."
           );
@@ -195,7 +195,7 @@ add_task(
 
     // Test with a window with empty history.
     let xpi =
-      "http://example.com/browser/browser/components/extensions/test/browser/empty.xpi";
+      "https://example.com/browser/browser/components/extensions/test/browser/empty.xpi";
     let newWin = await BrowserTestUtils.openNewBrowserWindow();
     await BrowserTestUtils.openNewForegroundTab({
       gBrowser: newWin.gBrowser,
@@ -205,7 +205,7 @@ add_task(
     });
     await BrowserTestUtils.openNewForegroundTab({
       gBrowser: newWin.gBrowser,
-      url: "http://example.com/",
+      url: "https://example.com/",
     });
     await BrowserTestUtils.closeWindow(newWin);
 
diff --git a/browser/components/extensions/test/browser/browser_ext_sessions_restoreTab.js b/browser/components/extensions/test/browser/browser_ext_sessions_restoreTab.js
index c89e9d39dc..46a925039a 100644
--- a/browser/components/extensions/test/browser/browser_ext_sessions_restoreTab.js
+++ b/browser/components/extensions/test/browser/browser_ext_sessions_restoreTab.js
@@ -15,7 +15,7 @@ ChromeUtils.defineESModuleGetters(this, {
 // Check that we can restore a tab modified by an extension.
 add_task(async function test_restoringModifiedTab() {
   function background() {
-    browser.tabs.create({ url: "http://example.com/" });
+    browser.tabs.create({ url: "https://example.com/" });
     browser.test.onMessage.addListener(msg => {
       if (msg == "change-tab") {
         browser.tabs.executeScript({ code: 'location.href += "?changedTab";' });
@@ -32,14 +32,14 @@ add_task(async function test_restoringModifiedTab() {
     background,
   });
 
-  const contentScriptTabURL = "http://example.com/?changedTab";
+  const contentScriptTabURL = "https://example.com/?changedTab";
 
   let win = await BrowserTestUtils.openNewBrowserWindow({});
 
   // Open and close a tabs.
   let tabPromise = BrowserTestUtils.waitForNewTab(
     win.gBrowser,
-    "http://example.com/",
+    "https://example.com/",
     true
   );
   await extension.startup();
diff --git a/browser/components/extensions/test/browser/browser_ext_sidebarAction.js b/browser/components/extensions/test/browser/browser_ext_sidebarAction.js
index 8498f73071..ac2d19cf23 100644
--- a/browser/components/extensions/test/browser/browser_ext_sidebarAction.js
+++ b/browser/components/extensions/test/browser/browser_ext_sidebarAction.js
@@ -7,6 +7,7 @@ requestLongerTimeout(2);
 let extData = {
   manifest: {
     sidebar_action: {
+      default_icon: "default.png",
       default_panel: "sidebar.html",
     },
   },
@@ -29,6 +30,9 @@ let extData = {
         browser.test.sendMessage("sidebar");
       };
     },
+
+    "default.png": imageBuffer,
+    "1.png": imageBuffer,
   },
 
   background: function () {
@@ -44,6 +48,8 @@ let extData = {
         let { arg = {}, result } = data;
         let isOpen = await browser.sidebarAction.isOpen(arg);
         browser.test.assertEq(result, isOpen, "expected value from isOpen");
+      } else if (msg === "set-icon") {
+        await browser.sidebarAction.setIcon({ path: data });
       }
       browser.test.sendMessage("done");
     });
@@ -148,7 +154,7 @@ add_task(async function sidebar_isOpen() {
   info("Test extension1's sidebar is opened on install");
   await extension1.awaitMessage("sidebar");
   await sendMessage(extension1, "isOpen", { result: true });
-  let sidebar1ID = SidebarUI.currentID;
+  let sidebar1ID = SidebarController.currentID;
 
   info("Load extension2");
   let extension2 = ExtensionTestUtils.loadExtension(getExtData());
@@ -160,7 +166,7 @@ add_task(async function sidebar_isOpen() {
   await sendMessage(extension2, "isOpen", { result: true });
 
   info("Switch back to extension1's sidebar");
-  SidebarUI.show(sidebar1ID);
+  SidebarController.show(sidebar1ID);
   await extension1.awaitMessage("sidebar");
   await sendMessage(extension1, "isOpen", { result: true });
   await sendMessage(extension2, "isOpen", { result: false });
@@ -195,7 +201,7 @@ add_task(async function sidebar_isOpen() {
   newWin.close();
 
   info("Close the sidebar in the original window");
-  SidebarUI.hide();
+  SidebarController.hide();
   await sendMessage(extension1, "isOpen", { result: false });
   await sendMessage(extension2, "isOpen", { result: false });
 
@@ -223,11 +229,15 @@ add_task(async function testShortcuts() {
 
   async function toggleSwitcherPanel(win = window) {
     // Open and close the switcher panel to trigger shortcut content rendering.
-    let switcherPanelShown = promisePopupShown(win.SidebarUI._switcherPanel);
-    win.SidebarUI.showSwitcherPanel();
+    let switcherPanelShown = promisePopupShown(
+      win.SidebarController._switcherPanel
+    );
+    win.SidebarController.showSwitcherPanel();
     await switcherPanelShown;
-    let switcherPanelHidden = promisePopupHidden(win.SidebarUI._switcherPanel);
-    win.SidebarUI.hideSwitcherPanel();
+    let switcherPanelHidden = promisePopupHidden(
+      win.SidebarController._switcherPanel
+    );
+    win.SidebarController.hideSwitcherPanel();
     await switcherPanelHidden;
   }
 
@@ -301,3 +311,39 @@ add_task(async function testShortcuts() {
 
   await BrowserTestUtils.closeWindow(win);
 });
+
+add_task(async function sidebar_switcher_panel_icon_update() {
+  info("Load extension");
+  const extension = ExtensionTestUtils.loadExtension(getExtData());
+  await extension.startup();
+
+  info("Test extension's sidebar is opened on install");
+  await extension.awaitMessage("sidebar");
+  await sendMessage(extension, "isOpen", { result: true });
+  const sidebarID = SidebarController.currentID;
+
+  const item = SidebarController._switcherPanel.querySelector(
+    ".webextension-menuitem"
+  );
+  let iconUrl = `moz-extension://${extension.uuid}/default.png`;
+  is(
+    item.style.getPropertyValue("--webextension-menuitem-image"),
+    `image-set(url("${iconUrl}"), url("${iconUrl}") 2x)`,
+    "Extension has the correct icon."
+  );
+  SidebarController.hide();
+  await sendMessage(extension, "isOpen", { result: false });
+
+  await sendMessage(extension, "set-icon", "1.png");
+  await SidebarController.show(sidebarID);
+  await extension.awaitMessage("sidebar");
+  await sendMessage(extension, "isOpen", { result: true });
+  iconUrl = `moz-extension://${extension.uuid}/1.png`;
+  is(
+    item.style.getPropertyValue("--webextension-menuitem-image"),
+    `image-set(url("${iconUrl}"), url("${iconUrl}") 2x)`,
+    "Extension has updated icon."
+  );
+
+  await extension.unload();
+});
diff --git a/browser/components/extensions/test/browser/browser_ext_sidebarAction_click.js b/browser/components/extensions/test/browser/browser_ext_sidebarAction_click.js
index 621d2d1180..a82f6b8186 100644
--- a/browser/components/extensions/test/browser/browser_ext_sidebarAction_click.js
+++ b/browser/components/extensions/test/browser/browser_ext_sidebarAction_click.js
@@ -54,7 +54,7 @@ add_task(async function test_sidebar_click_isAppTab_behavior() {
   await extension.awaitMessage("sidebar-ready");
 
   // This test fails if docShell.isAppTab has not been set to true.
-  let content = SidebarUI.browser.contentWindow;
+  let content = SidebarController.browser.contentWindow;
 
   // Wait for the layout to be flushed, otherwise this test may
   // fail intermittently if synthesizeMouseAtCenter is being called
diff --git a/browser/components/extensions/test/browser/browser_ext_sidebarAction_context.js b/browser/components/extensions/test/browser/browser_ext_sidebarAction_context.js
index 7057037a5e..93d34d4487 100644
--- a/browser/components/extensions/test/browser/browser_ext_sidebarAction_context.js
+++ b/browser/components/extensions/test/browser/browser_ext_sidebarAction_context.js
@@ -124,7 +124,7 @@ async function runTests(options) {
   });
 
   // Wait for initial sidebar load.
-  SidebarUI.browser.addEventListener(
+  SidebarController.browser.addEventListener(
     "load",
     async () => {
       // Wait for the background page listeners to be ready and
diff --git a/browser/components/extensions/test/browser/browser_ext_sidebarAction_httpAuth.js b/browser/components/extensions/test/browser/browser_ext_sidebarAction_httpAuth.js
index d50d96b822..f8ab238148 100644
--- a/browser/components/extensions/test/browser/browser_ext_sidebarAction_httpAuth.js
+++ b/browser/components/extensions/test/browser/browser_ext_sidebarAction_httpAuth.js
@@ -42,7 +42,7 @@ add_task(async function sidebar_httpAuthPrompt() {
 
   // Wait for the http auth prompt and close it with accept button.
   let promptPromise = PromptTestUtils.handleNextPrompt(
-    SidebarUI.browser.contentWindow,
+    SidebarController.browser.contentWindow,
     {
       modalType: Services.prompt.MODAL_TYPE_WINDOW,
       promptType: "promptUserAndPass",
diff --git a/browser/components/extensions/test/browser/browser_ext_sidebarAction_incognito.js b/browser/components/extensions/test/browser/browser_ext_sidebarAction_incognito.js
index 221447cf2e..39269d9d06 100644
--- a/browser/components/extensions/test/browser/browser_ext_sidebarAction_incognito.js
+++ b/browser/components/extensions/test/browser/browser_ext_sidebarAction_incognito.js
@@ -124,11 +124,14 @@ add_task(async function test_sidebarAction_not_allowed() {
 
   await extension.startup();
   let sidebarID = `${makeWidgetId(extension.id)}-sidebar-action`;
-  ok(SidebarUI.sidebars.has(sidebarID), "sidebar exists in non-private window");
+  ok(
+    SidebarController.sidebars.has(sidebarID),
+    "sidebar exists in non-private window"
+  );
 
   let winData = await getIncognitoWindow();
 
-  let hasSidebar = winData.win.SidebarUI.sidebars.has(sidebarID);
+  let hasSidebar = winData.win.SidebarController.sidebars.has(sidebarID);
   ok(!hasSidebar, "sidebar does not exist in private window");
   // Test API access to private window data.
   extension.sendMessage(winData.details);
diff --git a/browser/components/extensions/test/browser/browser_ext_sidebarAction_runtime.js b/browser/components/extensions/test/browser/browser_ext_sidebarAction_runtime.js
index 55c83ee0b1..8ac1dd76a1 100644
--- a/browser/components/extensions/test/browser/browser_ext_sidebarAction_runtime.js
+++ b/browser/components/extensions/test/browser/browser_ext_sidebarAction_runtime.js
@@ -52,9 +52,10 @@ add_task(async function test_sidebar_disconnect() {
   await connected;
 
   // Bug 1445080 fixes currentURI, test to avoid future breakage.
-  let currentURI = window.SidebarUI.browser.contentDocument.getElementById(
-    "webext-panels-browser"
-  ).currentURI;
+  let currentURI =
+    window.SidebarController.browser.contentDocument.getElementById(
+      "webext-panels-browser"
+    ).currentURI;
   is(currentURI.scheme, "moz-extension", "currentURI is set correctly");
 
   // switching sidebar to another extension
@@ -68,7 +69,7 @@ add_task(async function test_sidebar_disconnect() {
 
   // switching sidebar to built-in sidebar
   let disconnected = extension2.awaitMessage("disconnected");
-  window.SidebarUI.show("viewBookmarksSidebar");
+  window.SidebarController.show("viewBookmarksSidebar");
   await disconnected;
 
   await extension.unload();
diff --git a/browser/components/extensions/test/browser/browser_ext_sidebarAction_windows.js b/browser/components/extensions/test/browser/browser_ext_sidebarAction_windows.js
index 58f2b07797..c8f3f043ec 100644
--- a/browser/components/extensions/test/browser/browser_ext_sidebarAction_windows.js
+++ b/browser/components/extensions/test/browser/browser_ext_sidebarAction_windows.js
@@ -49,7 +49,7 @@ add_task(async function sidebar_windows() {
 
   let secondSidebar = extension.awaitMessage("sidebar");
 
-  // SidebarUI relies on window.opener being set, which is normal behavior when
+  // SidebarController relies on window.opener being set, which is normal behavior when
   // using menu or key commands to open a new browser window.
   let win = await BrowserTestUtils.openNewBrowserWindow();
 
diff --git a/browser/components/extensions/test/browser/browser_unified_extensions.js b/browser/components/extensions/test/browser/browser_unified_extensions.js
index 2c65f47c4e..b83d4c2e23 100644
--- a/browser/components/extensions/test/browser/browser_unified_extensions.js
+++ b/browser/components/extensions/test/browser/browser_unified_extensions.js
@@ -44,6 +44,9 @@ add_setup(async function () {
   // panel, which could happen when a previous test file resizes the current
   // window.
   await ensureMaximizedWindow(window);
+  await SpecialPowers.pushPrefEnv({
+    set: [["extensions.originControls.grantByDefault", false]],
+  });
 });
 
 add_task(async function test_button_enabled_by_pref() {
diff --git a/browser/components/extensions/test/browser/browser_unified_extensions_accessibility.js b/browser/components/extensions/test/browser/browser_unified_extensions_accessibility.js
index 44d861d97c..8439cf30dd 100644
--- a/browser/components/extensions/test/browser/browser_unified_extensions_accessibility.js
+++ b/browser/components/extensions/test/browser/browser_unified_extensions_accessibility.js
@@ -5,6 +5,12 @@
 
 loadTestSubscript("head_unified_extensions.js");
 
+add_setup(async () => {
+  await SpecialPowers.pushPrefEnv({
+    set: [["extensions.originControls.grantByDefault", false]],
+  });
+});
+
 add_task(async function test_keyboard_navigation_activeScript() {
   const extension1 = ExtensionTestUtils.loadExtension({
     manifest: {
diff --git a/browser/components/extensions/test/browser/browser_unified_extensions_context_menu.js b/browser/components/extensions/test/browser/browser_unified_extensions_context_menu.js
index d04d85e535..a7bdc8273c 100644
--- a/browser/components/extensions/test/browser/browser_unified_extensions_context_menu.js
+++ b/browser/components/extensions/test/browser/browser_unified_extensions_context_menu.js
@@ -5,10 +5,6 @@
 
 requestLongerTimeout(2);
 
-ChromeUtils.defineESModuleGetters(this, {
-  AbuseReporter: "resource://gre/modules/AbuseReporter.sys.mjs",
-});
-
 const { EnterprisePolicyTesting } = ChromeUtils.importESModule(
   "resource://testing-common/EnterprisePolicyTesting.sys.mjs"
 );
@@ -31,21 +27,6 @@ const promiseExtensionUninstalled = extensionId => {
   });
 };
 
-function waitClosedWindow(win) {
-  return new Promise(resolve => {
-    function onWindowClosed() {
-      if (win && !win.closed) {
-        // If a specific window reference has been passed, then check
-        // that the window is closed before resolving the promise.
-        return;
-      }
-      Services.obs.removeObserver(onWindowClosed, "xul-window-destroyed");
-      resolve();
-    }
-    Services.obs.addObserver(onWindowClosed, "xul-window-destroyed");
-  });
-}
-
 function assertVisibleContextMenuItems(contextMenu, expected) {
   let visibleItems = contextMenu.querySelectorAll(
     ":is(menuitem, menuseparator):not([hidden])"
@@ -366,90 +347,33 @@ add_task(async function test_report_extension() {
       // closed and about:addons is open with the "abuse report dialog".
       const hidden = BrowserTestUtils.waitForEvent(contextMenu, "popuphidden");
 
-      if (AbuseReporter.amoFormEnabled) {
-        const reportURL = Services.urlFormatter
-          .formatURLPref("extensions.abuseReport.amoFormURL")
-          .replace("%addonID%", extension.id);
-
-        const promiseReportTab = BrowserTestUtils.waitForNewTab(
-          gBrowser,
-          reportURL,
-          /* waitForLoad */ false,
-          // Do not expect it to be the next tab opened
-          /* waitForAnyTab */ true
-        );
-        contextMenu.activateItem(reportButton);
-        const [reportTab] = await Promise.all([promiseReportTab, hidden]);
-        // Remove the report tab and expect the selected tab
-        // to become the about:addons tab.
-        BrowserTestUtils.removeTab(reportTab);
-        if (AbuseReporter.amoFormEnabled) {
-          is(
-            gBrowser.selectedBrowser.currentURI.spec,
-            "about:blank",
-            "Expect about:addons tab to have not been opened (amoFormEnabled=true)"
-          );
-        } else {
-          is(
-            gBrowser.selectedBrowser.currentURI.spec,
-            "about:addons",
-            "Got about:addons tab selected (amoFormEnabled=false)"
-          );
-        }
-        return;
-      }
+      const reportURL = Services.urlFormatter
+        .formatURLPref("extensions.abuseReport.amoFormURL")
+        .replace("%addonID%", extension.id);
 
-      const abuseReportOpen = BrowserTestUtils.waitForCondition(
-        () => AbuseReporter.getOpenDialog(),
-        "wait for the abuse report dialog to have been opened"
+      const promiseReportTab = BrowserTestUtils.waitForNewTab(
+        gBrowser,
+        reportURL,
+        /* waitForLoad */ false,
+        // Do not expect it to be the next tab opened
+        /* waitForAnyTab */ true
       );
       contextMenu.activateItem(reportButton);
-      const [reportDialogWindow] = await Promise.all([abuseReportOpen, hidden]);
-
-      const reportDialogParams =
-        reportDialogWindow.arguments[0].wrappedJSObject;
-      is(
-        reportDialogParams.report.addon.id,
-        extension.id,
-        "abuse report dialog has the expected addon id"
-      );
+      const [reportTab] = await Promise.all([promiseReportTab, hidden]);
+      // Remove the report tab and expect the selected tab
+      // to become the about:addons tab.
+      BrowserTestUtils.removeTab(reportTab);
       is(
-        reportDialogParams.report.reportEntryPoint,
-        "unified_context_menu",
-        "abuse report dialog has the expected reportEntryPoint"
+        gBrowser.selectedBrowser.currentURI.spec,
+        "about:blank",
+        "Expect about:addons tab to have not been opened"
       );
-
-      let promiseClosedWindow = waitClosedWindow();
-      reportDialogWindow.close();
-      // Wait for the report dialog window to be completely closed
-      // (to prevent an intermittent failure due to a race between
-      // the dialog window being closed and the test tasks that follows
-      // opening the unified extensions button panel to not lose the
-      // focus and be suddently closed before the task has done with
-      // its assertions, see Bug 1782304).
-      await promiseClosedWindow;
     });
   }
 
   const [ext] = createExtensions([{ name: "an extension" }]);
   await ext.startup();
-
-  info("Test report with amoFormEnabled=true");
-
-  await SpecialPowers.pushPrefEnv({
-    set: [["extensions.abuseReport.amoFormEnabled", true]],
-  });
   await runReportTest(ext);
-  await SpecialPowers.popPrefEnv();
-
-  info("Test report with amoFormEnabled=false");
-
-  await SpecialPowers.pushPrefEnv({
-    set: [["extensions.abuseReport.amoFormEnabled", false]],
-  });
-  await runReportTest(ext);
-  await SpecialPowers.popPrefEnv();
-
   await ext.unload();
 });
 
diff --git a/browser/components/extensions/test/browser/head.js b/browser/components/extensions/test/browser/head.js
index 344eb3cca7..2d6835a034 100644
--- a/browser/components/extensions/test/browser/head.js
+++ b/browser/components/extensions/test/browser/head.js
@@ -31,6 +31,7 @@
  *          loadTestSubscript awaitBrowserLoaded
  *          getScreenAt roundCssPixcel getCssAvailRect isRectContained
  *          getToolboxBackgroundColor
+ *          promiseBrowserContentUnloaded
  */
 
 // There are shutdown issues for which multiple rejections are left uncaught.
@@ -167,6 +168,44 @@ function promiseAnimationFrame(win = window) {
   return AppUiTestInternals.promiseAnimationFrame(win);
 }
 
+async function promiseBrowserContentUnloaded(browser) {
+  // Wait until the content has unloaded before resuming the test, to avoid
+  // calling extension.getViews too early (and having intermittent failures).
+  const MSG_WINDOW_DESTROYED = "Test:BrowserContentDestroyed";
+  let unloadPromise = new Promise(resolve => {
+    Services.ppmm.addMessageListener(MSG_WINDOW_DESTROYED, function listener() {
+      Services.ppmm.removeMessageListener(MSG_WINDOW_DESTROYED, listener);
+      resolve();
+    });
+  });
+
+  await ContentTask.spawn(
+    browser,
+    MSG_WINDOW_DESTROYED,
+    MSG_WINDOW_DESTROYED => {
+      let innerWindowId = this.content.windowGlobalChild.innerWindowId;
+      let observer = subject => {
+        if (
+          innerWindowId === subject.QueryInterface(Ci.nsISupportsPRUint64).data
+        ) {
+          Services.obs.removeObserver(observer, "inner-window-destroyed");
+
+          // Use process message manager to ensure that the message is delivered
+          // even after the <browser>'s message manager is disconnected.
+          Services.cpmm.sendAsyncMessage(MSG_WINDOW_DESTROYED);
+        }
+      };
+      // Observe inner-window-destroyed, like ExtensionPageChild, to ensure that
+      // the ExtensionPageContextChild instance has been unloaded when we resolve
+      // the unloadPromise.
+      Services.obs.addObserver(observer, "inner-window-destroyed");
+    }
+  );
+
+  // Return an object so that callers can use "await".
+  return { unloadPromise };
+}
+
 function promisePopupHidden(popup) {
   return new Promise(resolve => {
     let onPopupHidden = () => {
@@ -437,10 +476,11 @@ async function openContextMenuInPopup(
 }
 
 async function openContextMenuInSidebar(selector = "body") {
-  let contentAreaContextMenu = SidebarUI.browser.contentDocument.getElementById(
-    "contentAreaContextMenu"
-  );
-  let browser = SidebarUI.browser.contentDocument.getElementById(
+  let contentAreaContextMenu =
+    SidebarController.browser.contentDocument.getElementById(
+      "contentAreaContextMenu"
+    );
+  let browser = SidebarController.browser.contentDocument.getElementById(
     "webext-panels-browser"
   );
   let popupShownPromise = BrowserTestUtils.waitForEvent(
@@ -452,7 +492,9 @@ async function openContextMenuInSidebar(selector = "body") {
   // fail intermittently if synthesizeMouseAtCenter is being called
   // while the sidebar is still opening and the browser window layout
   // being recomputed.
-  await SidebarUI.browser.contentWindow.promiseDocumentFlushed(() => {});
+  await SidebarController.browser.contentWindow.promiseDocumentFlushed(
+    () => {}
+  );
 
   info("Opening context menu in sidebarAction panel");
   await BrowserTestUtils.synthesizeMouseAtCenter(