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: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/85d69dbc92f8d133d7a2a44bfb0603d7742ce56e/bookmarksMenu.js/clean/xpfe/components/bookmarks/resources/bookmarksMenu.js