diff -r 000000000000 -r 6474c204b198 browser/components/customizableui/test/browser_1003588_no_specials_in_panel.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/customizableui/test/browser_1003588_no_specials_in_panel.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,92 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+
+add_task(function* checkNoAddingToPanel() {
+  let area = CustomizableUI.AREA_PANEL;
+  let previousPlacements = getAreaWidgetIds(area);
+  CustomizableUI.addWidgetToArea("separator", area);
+  CustomizableUI.addWidgetToArea("spring", area);
+  CustomizableUI.addWidgetToArea("spacer", area);
+  assertAreaPlacements(area, previousPlacements);
+
+  let oldNumberOfItems = previousPlacements.length;
+  if (getAreaWidgetIds(area).length != oldNumberOfItems) {
+    CustomizableUI.reset();
+  }
+});
+
+add_task(function* checkAddingToToolbar() {
+  let area = CustomizableUI.AREA_NAVBAR;
+  let previousPlacements = getAreaWidgetIds(area);
+  CustomizableUI.addWidgetToArea("separator", area);
+  CustomizableUI.addWidgetToArea("spring", area);
+  CustomizableUI.addWidgetToArea("spacer", area);
+  let expectedPlacements = [...previousPlacements].concat([
+    /separator/,
+    /spring/,
+    /spacer/
+  ]);
+  assertAreaPlacements(area, expectedPlacements);
+
+  let newlyAddedElements = getAreaWidgetIds(area).slice(-3);
+  while (newlyAddedElements.length) {
+    CustomizableUI.removeWidgetFromArea(newlyAddedElements.shift());
+  }
+
+  assertAreaPlacements(area, previousPlacements);
+
+  let oldNumberOfItems = previousPlacements.length;
+  if (getAreaWidgetIds(area).length != oldNumberOfItems) {
+    CustomizableUI.reset();
+  }
+});
+
+
+add_task(function* checkDragging() {
+  let startArea = CustomizableUI.AREA_NAVBAR;
+  let targetArea = CustomizableUI.AREA_PANEL;
+  let startingToolbarPlacements = getAreaWidgetIds(startArea);
+  let startingTargetPlacements = getAreaWidgetIds(targetArea);
+
+  CustomizableUI.addWidgetToArea("separator", startArea);
+  CustomizableUI.addWidgetToArea("spring", startArea);
+  CustomizableUI.addWidgetToArea("spacer", startArea);
+
+  let placementsWithSpecials = getAreaWidgetIds(startArea);
+  let elementsToMove = [];
+  for (let id of placementsWithSpecials) {
+    if (CustomizableUI.isSpecialWidget(id)) {
+      elementsToMove.push(id);
+    }
+  }
+  is(elementsToMove.length, 3, "Should have 3 elements to try and drag.");
+
+  yield startCustomizing();
+  for (let id of elementsToMove) {
+    simulateItemDrag(document.getElementById(id), PanelUI.contents);
+  }
+
+  assertAreaPlacements(startArea, placementsWithSpecials);
+  assertAreaPlacements(targetArea, startingTargetPlacements);
+
+  for (let id of elementsToMove) {
+    simulateItemDrag(document.getElementById(id), gCustomizeMode.visiblePalette);
+  }
+
+  assertAreaPlacements(startArea, startingToolbarPlacements);
+  assertAreaPlacements(targetArea, startingTargetPlacements);
+
+  ok(!gCustomizeMode.visiblePalette.querySelector("toolbarspring,toolbarseparator,toolbarspacer"),
+     "No specials should make it to the palette alive.");
+  yield endCustomizing();
+});
+
+
+add_task(function* asyncCleanup() {
+  yield endCustomizing();
+  CustomizableUI.reset();
+});
+