diff -r 000000000000 -r 6474c204b198 browser/components/customizableui/test/browser_914863_disabled_help_quit_buttons.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/customizableui/test/browser_914863_disabled_help_quit_buttons.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+/* 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/. */
+
+// Entering then exiting customization mode should reenable the Help and Exit buttons.
+add_task(function() {
+  yield startCustomizing();
+  let helpButton = document.getElementById("PanelUI-help");
+  let quitButton = document.getElementById("PanelUI-quit");
+  ok(helpButton.getAttribute("disabled") == "true", "Help button should be disabled while in customization mode.");
+  ok(quitButton.getAttribute("disabled") == "true", "Quit button should be disabled while in customization mode.");
+  yield endCustomizing();
+
+  ok(!helpButton.hasAttribute("disabled"), "Help button should not be disabled.");
+  ok(!quitButton.hasAttribute("disabled"), "Quit button should not be disabled.");
+});