diff -r 000000000000 -r 6474c204b198 browser/components/customizableui/test/browser_978084_dragEnd_after_move.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/customizableui/test/browser_978084_dragEnd_after_move.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,44 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+let draggedItem;
+
+/**
+ * Check that customizing-movingItem gets removed on a drop when the item is moved.
+ */
+
+// Drop on the palette
+add_task(function() {
+  draggedItem = document.createElement("toolbarbutton");
+  draggedItem.id = "test-dragEnd-after-move1";
+  draggedItem.setAttribute("label", "Test");
+  draggedItem.setAttribute("removable", "true");
+  let navbar = document.getElementById("nav-bar");
+  navbar.customizationTarget.appendChild(draggedItem);
+  yield startCustomizing();
+  simulateItemDrag(draggedItem, gCustomizeMode.visiblePalette);
+  is(document.documentElement.hasAttribute("customizing-movingItem"), false,
+     "Make sure customizing-movingItem is removed after dragging to the palette");
+});
+
+// Drop on a customization target itself
+add_task(function() {
+  draggedItem = document.createElement("toolbarbutton");
+  draggedItem.id = "test-dragEnd-after-move2";
+  draggedItem.setAttribute("label", "Test");
+  draggedItem.setAttribute("removable", "true");
+  let dest = createToolbarWithPlacements("test-dragEnd");
+  let navbar = document.getElementById("nav-bar");
+  navbar.customizationTarget.appendChild(draggedItem);
+  yield startCustomizing();
+  simulateItemDrag(draggedItem, dest.customizationTarget);
+  is(document.documentElement.hasAttribute("customizing-movingItem"), false,
+     "Make sure customizing-movingItem is removed");
+});
+
+add_task(function asyncCleanup() {
+  yield endCustomizing();
+  yield resetCustomization();
+});