diff -r 000000000000 -r 6474c204b198 browser/components/customizableui/test/browser_886323_buildArea_removable_nodes.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/customizableui/test/browser_886323_buildArea_removable_nodes.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,46 @@
+/* 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 kButtonId = "test-886323-removable-moved-node";
+const kLazyAreaId = "test-886323-lazy-area-for-removability-testing";
+
+let gNavBar = document.getElementById(CustomizableUI.AREA_NAVBAR);
+let gLazyArea;
+
+// Removable nodes shouldn't be moved by buildArea
+add_task(function() {
+  let dummyBtn = createDummyXULButton(kButtonId, "Dummy");
+  dummyBtn.setAttribute("removable", "true");
+  gNavBar.customizationTarget.appendChild(dummyBtn);
+  let popupSet = document.getElementById("mainPopupSet");
+  gLazyArea = document.createElementNS(kNSXUL, "panel");
+  gLazyArea.id = kLazyAreaId;
+  gLazyArea.setAttribute("hidden", "true");
+  popupSet.appendChild(gLazyArea);
+  CustomizableUI.registerArea(kLazyAreaId, {
+    type: CustomizableUI.TYPE_MENU_PANEL,
+    defaultPlacements: []
+  });
+  CustomizableUI.addWidgetToArea(kButtonId, kLazyAreaId);
+  assertAreaPlacements(kLazyAreaId, [kButtonId],
+                       "Placements should have changed because widget is removable.");
+  let btn = document.getElementById(kButtonId);
+  btn.setAttribute("removable", "false");
+  gLazyArea.customizationTarget = gLazyArea;
+  CustomizableUI.registerToolbarNode(gLazyArea, []);
+  assertAreaPlacements(kLazyAreaId, [], "Placements should no longer include widget.");
+  is(btn.parentNode.id, gNavBar.customizationTarget.id,
+     "Button shouldn't actually have moved as it's not removable");
+  let btn = document.getElementById(kButtonId);
+  if (btn) btn.remove();
+  CustomizableUI.removeWidgetFromArea(kButtonId);
+  CustomizableUI.unregisterArea(kLazyAreaId);
+  gLazyArea.remove();
+});
+
+add_task(function asyncCleanup() {
+  yield resetCustomization();
+});