1 files changed, 64 insertions, 0 deletions
diff --git a/browser/base/content/test/tabs/browser_tabContextMenu_keyboard.js b/browser/base/content/test/tabs/browser_tabContextMenu_keyboard.js
new file mode 100644
index 0000000000..f3a2066653
--- /dev/null
+++ b/browser/base/content/test/tabs/browser_tabContextMenu_keyboard.js
@@ -0,0 +1,64 @@
+/* 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/. */
+
+async function openContextMenu() {
+  let contextMenu = document.getElementById("tabContextMenu");
+  let popupShown = BrowserTestUtils.waitForEvent(contextMenu, "popupshown");
+  EventUtils.synthesizeMouseAtCenter(gBrowser.selectedTab, {
+    type: "contextmenu",
+    button: 2,
+  });
+  await popupShown;
+}
+
+async function closeContextMenu() {
+  let contextMenu = document.getElementById("tabContextMenu");
+  let popupHidden = BrowserTestUtils.waitForEvent(contextMenu, "popuphidden");
+  EventUtils.synthesizeKey("KEY_Escape");
+  await popupHidden;
+}
+
+add_task(async function test() {
+  if (Services.prefs.getBoolPref("widget.macos.native-context-menus", false)) {
+    ok(
+      true,
+      "This bug is not possible when native context menus are enabled on macOS."
+    );
+    return;
+  }
+  // Ensure tabs are focusable.
+  await SpecialPowers.pushPrefEnv({ set: [["accessibility.tabfocus", 7]] });
+
+  // There should be one tab when we start the test.
+  let tab1 = gBrowser.selectedTab;
+  let tab2 = BrowserTestUtils.addTab(gBrowser);
+  tab1.focus();
+  is(document.activeElement, tab1, "tab1 should be focused");
+
+  // Ensure that DownArrow doesn't switch to tab2 while the context menu is open.
+  await openContextMenu();
+  EventUtils.synthesizeKey("KEY_ArrowDown");
+  await closeContextMenu();
+  is(gBrowser.selectedTab, tab1, "tab1 should still be active");
+  if (AppConstants.platform == "macosx") {
+    // On Mac, focus doesn't return to the tab after dismissing the context menu.
+    // Since we're not testing that here, work around it by just focusing again.
+    tab1.focus();
+  }
+  is(document.activeElement, tab1, "tab1 should be focused");
+
+  // Switch to tab2 by pressing DownArrow.
+  await BrowserTestUtils.switchTab(gBrowser, () =>
+    EventUtils.synthesizeKey("KEY_ArrowDown")
+  );
+  is(gBrowser.selectedTab, tab2, "should have switched to tab2");
+  is(document.activeElement, tab2, "tab2 should now be focused");
+  // Ensure that UpArrow doesn't switch to tab1 while the context menu is open.
+  await openContextMenu();
+  EventUtils.synthesizeKey("KEY_ArrowUp");
+  await closeContextMenu();
+  is(gBrowser.selectedTab, tab2, "tab2 should still be active");
+
+  gBrowser.removeTab(tab2);
+});