diff -r 000000000000 -r 6474c204b198 browser/components/customizableui/test/browser_948985_non_removable_defaultArea.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/customizableui/test/browser_948985_non_removable_defaultArea.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+/* 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/. */
+
+const kWidgetId = "test-destroy-non-removable-defaultArea";
+
+add_task(function() {
+  let spec = {id: kWidgetId, label: "Test non-removable defaultArea re-adding.",
+              removable: false, defaultArea: CustomizableUI.AREA_NAVBAR};
+  CustomizableUI.createWidget(spec);
+  let placement = CustomizableUI.getPlacementOfWidget(kWidgetId);
+  ok(placement, "Should have placed the widget.");
+  is(placement && placement.area, CustomizableUI.AREA_NAVBAR, "Widget should be in navbar");
+  CustomizableUI.destroyWidget(kWidgetId);
+  CustomizableUI.removeWidgetFromArea(kWidgetId);
+
+  CustomizableUI.createWidget(spec);
+  ok(placement, "Should have placed the widget.");
+  is(placement && placement.area, CustomizableUI.AREA_NAVBAR, "Widget should be in navbar");
+  CustomizableUI.destroyWidget(kWidgetId);
+  CustomizableUI.removeWidgetFromArea(kWidgetId);
+
+  const kPrefCustomizationAutoAdd = "browser.uiCustomization.autoAdd";
+  Services.prefs.setBoolPref(kPrefCustomizationAutoAdd, false);
+  CustomizableUI.createWidget(spec);
+  ok(placement, "Should have placed the widget.");
+  is(placement && placement.area, CustomizableUI.AREA_NAVBAR, "Widget should be in navbar");
+  CustomizableUI.destroyWidget(kWidgetId);
+  CustomizableUI.removeWidgetFromArea(kWidgetId);
+  Services.prefs.clearUserPref(kPrefCustomizationAutoAdd);
+});
+