const prefService = Components. 
var prefService = Components. 
        register: function() {            const prefService = Components.                classes["@mozilla.org/preferences-service;1"].                getService(Components.interfaces.nsIPrefService);            this.private_branch = prefService.getBranch("extensions."+that.MYSTRING+".");            this.private_branch.QueryInterface(Components.interfaces.nsIPrefBranch2);            this.private_branch.addObserver("", this, false);            /* setup the preferences */            for(var type in this.types) {                that.preferences[type] = that.preferences.private_get(type);            }        },
4040	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/4040/967386313a0d67d4ce5f98df58baa2a5345804fe/itsalltext.js/buggy/src/chrome/content/itsalltext.js