rem:  this.toggleAutoFillInURLBar(); 
add:  this.toggleAutoHideTabbar(); 
context:   observe: function (aSubject, aTopic, aPrefName)  {    if (aTopic != "nsPref:changed" || aPrefName != this.domain)      return;          this.toggleAutoFillInURLBar();  },
meta: 5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5459/be9a0c74fedc74eab526d642a14e44dc68a2af07/browser.js/buggy/browser/base/content/browser.js