add: if (branch) return branch.getBoolPref (prefName); 
context: function getBoolPref (prefName, defaultValue){    var e;    try    {        return client.prefBranch.getBoolPref (prefName);    }    catch (e)    {        return defaultValue;    }    }
meta: 1622	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1622/ae3e9c530285bc8229345d073a6ffe21da75636f/readprefs.js/clean/xul/content/readprefs.js