add: var prefService = Components.classes["@mozilla.org/preferences-service;1"]; prefService = prefService.getService(Components.interfaces.nsIPrefService); var prefBranch = prefService.getBranch(null);  prefBranch.removeObserver("network.proxy.type", proxyTypeObserver); 
context: function utilityOnUnload(aEvent) {  var observerService = Components.classes[kObserverServiceProgID]			  .getService(Components.interfaces.nsIObserverService);  observerService.removeObserver(offlineObserver, "network:offline-status-changed");}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/518649d98ba82b56cd56ff962eb0696c40920583/utilityOverlay.js/buggy/xpfe/communicator/resources/content/utilityOverlay.js