rem: if (gDownloadManager) os.removeObserver(gDownloadManager, "xpinstall-download-started"); 
add: os.removeObserver(gAddonsMsgObserver, "addons-message-notification"); os.removeObserver(gDownloadManager, "xpinstall-download-started"); 
context: function Shutdown() {  if (gWindowState != "extensions")    gExtensionsView.removeEventListener("select", onThemeSelect, false);    gExtensionsView.removeEventListener("extension-updatenow", onExtensionUpdateNow, false);  gExtensionsView.database.RemoveDataSource(gExtensionManager.datasource);  gExtensionManager.removeUpdateListenerAt(gObserverIndex);  var os = Components.classes["@mozilla.org/observer-service;1"]                     .getService(Components.interfaces.nsIObserverService);  if (gDownloadManager)     os.removeObserver(gDownloadManager, "xpinstall-download-started");}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/e70cc1872d3fa7a9c82c261be41c9d7d67b9d270/extensions.js/buggy/toolkit/mozapps/extensions/content/extensions.js