add: PrefUtils.removeObserver("inspector", PrefChangeObserver); 
context:   exit: function()  {    window.close()  },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/73c9a1111f3d6e085e25cfcd0d150659488f11a0/InspectorSidebar.js/clean/extensions/inspector/resources/content/sidebar/InspectorSidebar.js