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: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/fe1be84a39a9ba7c17b14ef3f9addbcc6d52bd1d/bookmarksMenu.js/buggy/browser/components/bookmarks/content/bookmarksMenu.js