rem: document.getElementById("bookmarks-ptf"), document.getElementById("bookmarks-menu").parentNode 
add: document.getAnonymousElementByAttribute(bt , "anonid", "bookmarks-ptf"), document.getElementById("bookmarks-menu").parentNode, document.getAnonymousElementByAttribute(bt , "class", "chevron").parentNode 
context:   get mObservers ()  {    if (!this._observers) {      this._observers = [        document.getElementById("bookmarks-ptf"),        document.getElementById("bookmarks-menu").parentNode      ]    }    return this._observers;  },
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/88086f032538fd7ee413478489483c10317499b2/browser.js/buggy/browser/base/content/browser.js