1 files changed, 39 insertions, 0 deletions
diff --git a/browser/components/customizableui/test/browser_972267_customizationchange_events.js b/browser/components/customizableui/test/browser_972267_customizationchange_events.js
new file mode 100644
index 0000000000..7d27b94136
--- /dev/null
+++ b/browser/components/customizableui/test/browser_972267_customizationchange_events.js
@@ -0,0 +1,39 @@
+/* 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";
+
+// Create a new window, then move the stop/reload button to the menu and check both windows have
+// customizationchange events fire on the toolbox:
+add_task(async function () {
+  let newWindow = await openAndLoadWindow();
+  let otherToolbox = newWindow.gNavToolbox;
+
+  let handlerCalledCount = 0;
+  let handler = ev => {
+    handlerCalledCount++;
+  };
+
+  let stopReloadButton = document.getElementById("stop-reload-button");
+
+  gNavToolbox.addEventListener("customizationchange", handler);
+  otherToolbox.addEventListener("customizationchange", handler);
+
+  await gCustomizeMode.addToPanel(stopReloadButton);
+
+  is(handlerCalledCount, 2, "Should be called for both windows.");
+
+  handlerCalledCount = 0;
+  gCustomizeMode.addToToolbar(stopReloadButton);
+  is(handlerCalledCount, 2, "Should be called for both windows.");
+
+  gNavToolbox.removeEventListener("customizationchange", handler);
+  otherToolbox.removeEventListener("customizationchange", handler);
+
+  await promiseWindowClosed(newWindow);
+});
+
+add_task(async function asyncCleanup() {
+  await resetCustomization();
+});