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diff --git a/comm/mail/components/extensions/test/browser/browser_ext_bug1812530.js b/comm/mail/components/extensions/test/browser/browser_ext_bug1812530.js
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+++ b/comm/mail/components/extensions/test/browser/browser_ext_bug1812530.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at http://mozilla.org/MPL/2.0/. *
+ */
+
+// Load subscript shared with all menu tests.
+Services.scriptloader.loadSubScript(
+  new URL("head_menus.js", gTestPath).href,
+  this
+);
+
+let { MockRegistrar } = ChromeUtils.importESModule(
+  "resource://testing-common/MockRegistrar.sys.mjs"
+);
+
+/** @implements {nsIExternalProtocolService} */
+let mockExternalProtocolService = {
+  _loadedURLs: [],
+  externalProtocolHandlerExists(protocolScheme) {},
+  getApplicationDescription(scheme) {},
+  getProtocolHandlerInfo(protocolScheme) {},
+  getProtocolHandlerInfoFromOS(protocolScheme, found) {},
+  isExposedProtocol(protocolScheme) {},
+  loadURI(uri, windowContext) {
+    this._loadedURLs.push(uri.spec);
+  },
+  setProtocolHandlerDefaults(handlerInfo, osHandlerExists) {},
+  urlLoaded(url) {
+    return this._loadedURLs.includes(url);
+  },
+  QueryInterface: ChromeUtils.generateQI(["nsIExternalProtocolService"]),
+};
+
+let mockExternalProtocolServiceCID = MockRegistrar.register(
+  "@mozilla.org/uriloader/external-protocol-service;1",
+  mockExternalProtocolService
+);
+
+add_setup(async () => {
+  let account = createAccount();
+  let rootFolder = account.incomingServer.rootFolder;
+  let subFolders = rootFolder.subFolders;
+  createMessages(subFolders[0], 10);
+
+  let about3Pane = document.getElementById("tabmail").currentAbout3Pane;
+  about3Pane.restoreState({
+    folderPaneVisible: true,
+    folderURI: subFolders[0],
+    messagePaneVisible: true,
+  });
+  about3Pane.threadTree.selectedIndex = 0;
+  await awaitBrowserLoaded(
+    about3Pane.messageBrowser.contentWindow.getMessagePaneBrowser()
+  );
+});
+
+registerCleanupFunction(() => {
+  MockRegistrar.unregister(mockExternalProtocolServiceCID);
+});
+
+const subtest_clickOpenInBrowserContextMenu = async (extension, getBrowser) => {
+  async function contextClick(elementSelector, browser) {
+    await awaitBrowserLoaded(browser, url => url != "about:blank");
+
+    let menuId = browser.getAttribute("context");
+    let menu = browser.ownerGlobal.top.document.getElementById(menuId);
+    let hiddenPromise = BrowserTestUtils.waitForEvent(menu, "popuphidden");
+    await rightClickOnContent(menu, elementSelector, browser);
+    Assert.ok(
+      menu.querySelector("#browserContext-openInBrowser"),
+      "menu item should exist"
+    );
+    menu.activateItem(menu.querySelector("#browserContext-openInBrowser"));
+    await hiddenPromise;
+  }
+
+  await extension.startup();
+
+  // Wait for click on #description
+  {
+    let { elementSelector, url } = await extension.awaitMessage("contextClick");
+    Assert.equal(
+      "#description",
+      elementSelector,
+      `Test should click on the correct element.`
+    );
+    Assert.equal(
+      "https://example.org/browser/comm/mail/components/extensions/test/browser/data/content.html",
+      url,
+      `Test should open the correct page.`
+    );
+    await contextClick(elementSelector, getBrowser());
+    Assert.ok(
+      mockExternalProtocolService.urlLoaded(url),
+      `Page should have correctly been opened in external browser.`
+    );
+    await extension.sendMessage();
+  }
+
+  await extension.awaitFinish();
+  await extension.unload();
+};
+
+add_task(async function test_tabs() {
+  let extension = ExtensionTestUtils.loadExtension({
+    files: {
+      "utils.js": await getUtilsJS(),
+      "background.js": async () => {
+        // Open remote file and re-open it in the browser.
+        const url =
+          "https://example.org/browser/comm/mail/components/extensions/test/browser/data/content.html";
+        const elementSelector = "#description";
+
+        let testTab = await browser.tabs.create({ url });
+        await window.sendMessage("contextClick", { elementSelector, url });
+        await browser.tabs.remove(testTab.id);
+
+        browser.test.notifyPass();
+      },
+    },
+    manifest: {
+      background: {
+        scripts: ["utils.js", "background.js"],
+      },
+      permissions: ["tabs"],
+    },
+  });
+
+  await subtest_clickOpenInBrowserContextMenu(
+    extension,
+    () => document.getElementById("tabmail").currentTabInfo.browser
+  );
+});
+
+add_task(async function test_windows() {
+  let extension = ExtensionTestUtils.loadExtension({
+    files: {
+      "utils.js": await getUtilsJS(),
+      "background.js": async () => {
+        // Open remote file and re-open it in the browser.
+        const url =
+          "https://example.org/browser/comm/mail/components/extensions/test/browser/data/content.html";
+        const elementSelector = "#description";
+
+        let testWindow = await browser.windows.create({ type: "popup", url });
+        await window.sendMessage("contextClick", { elementSelector, url });
+        await browser.windows.remove(testWindow.id);
+
+        browser.test.notifyPass();
+      },
+    },
+    manifest: {
+      background: {
+        scripts: ["utils.js", "background.js"],
+      },
+      permissions: ["tabs"],
+    },
+  });
+
+  await subtest_clickOpenInBrowserContextMenu(
+    extension,
+    () => Services.wm.getMostRecentWindow("mail:extensionPopup").browser
+  );
+});
+
+add_task(async function test_mail3pane() {
+  let extension = ExtensionTestUtils.loadExtension({
+    files: {
+      "utils.js": await getUtilsJS(),
+      "background.js": async () => {
+        // Open remote file and re-open it in the browser.
+        const url =
+          "https://example.org/browser/comm/mail/components/extensions/test/browser/data/content.html";
+        const elementSelector = "#description";
+
+        let mailTabs = await browser.tabs.query({ type: "mail" });
+        browser.test.assertEq(
+          1,
+          mailTabs.length,
+          "Should find a single mailTab"
+        );
+        await browser.tabs.update(mailTabs[0].id, { url });
+        await window.sendMessage("contextClick", { elementSelector, url });
+
+        browser.test.notifyPass();
+      },
+    },
+    manifest: {
+      background: {
+        scripts: ["utils.js", "background.js"],
+      },
+      permissions: ["tabs"],
+    },
+  });
+
+  await subtest_clickOpenInBrowserContextMenu(
+    extension,
+    () => document.getElementById("tabmail").currentTabInfo.browser
+  );
+});