add: osvr.addObserver(this, "browser:purge-session-history", false); 
context:   _init: function()   {    // observer registration    const osvr = Components.classes['@mozilla.org/observer-service;1']                           .getService(Components.interfaces.nsIObserverService);    osvr.addObserver(this, "profile-change-teardown", false);    osvr.addObserver(this, "xpcom-shutdown", false);    osvr.addObserver(this, "final-ui-startup", false);  },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/15076987ab622b120a36fac133e376d4684af683/nsBrowserGlue.js/clean/browser/components/nsBrowserGlue.js