1 files changed, 45 insertions, 0 deletions
diff --git a/browser/components/customizableui/test/browser_938995_indefaultstate_nonremovable.js b/browser/components/customizableui/test/browser_938995_indefaultstate_nonremovable.js
new file mode 100644
index 0000000000..2d926e1725
--- /dev/null
+++ b/browser/components/customizableui/test/browser_938995_indefaultstate_nonremovable.js
@@ -0,0 +1,45 @@
+/* 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";
+
+const kWidgetId = "test-non-removable-widget";
+
+// Adding non-removable items to a toolbar or the panel shouldn't change inDefaultState
+add_task(async function () {
+  ok(CustomizableUI.inDefaultState, "Should start in default state");
+
+  let button = createDummyXULButton(
+    kWidgetId,
+    "Test non-removable inDefaultState handling"
+  );
+  CustomizableUI.addWidgetToArea(kWidgetId, CustomizableUI.AREA_NAVBAR);
+  button.setAttribute("removable", "false");
+  ok(
+    CustomizableUI.inDefaultState,
+    "Should still be in default state after navbar addition"
+  );
+  button.remove();
+
+  button = createDummyXULButton(
+    kWidgetId,
+    "Test non-removable inDefaultState handling"
+  );
+  CustomizableUI.addWidgetToArea(
+    kWidgetId,
+    CustomizableUI.AREA_FIXED_OVERFLOW_PANEL
+  );
+  button.setAttribute("removable", "false");
+  ok(
+    CustomizableUI.inDefaultState,
+    "Should still be in default state after panel addition"
+  );
+  button.remove();
+  ok(
+    CustomizableUI.inDefaultState,
+    "Should be in default state after destroying both widgets"
+  );
+  // reset now that button is gone.
+  CustomizableUI.reset();
+});