add: document.getElementById("bookmarks-chevron").parentNode, 
context:   get mObservers ()  {    if (!this._observers) {      this._observers = [        document.getElementById("bookmarks-ptf"),        document.getElementById("BookmarksMenu").parentNode,        document.getElementById("PersonalToolbar")      ]    }    return this._observers;  },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/255ddf07f0afef7fa33310048f3fc6146d06e9f1/bookmarksMenu.js/buggy/xpfe/components/bookmarks/resources/bookmarksMenu.js