add:  BookmarksMenuDNDObserver.mCurrentDragOverTarget = null; BookmarksMenuDNDObserver.onDragCloseTarget(); 
context:   destroyContextMenu: function (aEvent)  {    if (content)       content.focus()    BookmarksMenuDNDObserver.onDragRemoveFeedBack(document.popupNode); // needed on cancel    aEvent.target.removeEventListener("mousemove", BookmarksMenuController.onMouseMove, false)  },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/4c1429424dc150e461b1ad87373f3bac20e3cb4a/bookmarksMenu.js/clean/browser/components/bookmarks/content/bookmarksMenu.js