add: dnsResolveCachedHost = null; 
context: function dnsResolve(host) {    if (host == dnsResolveCachedHost) {        return dnsResolveCachedIp;    }    dnsResolveCachedHost = host;    try {        dnsResolveCachedIp = dns.resolve(host);    }    catch (e) {        dnsResolveCachedIp = null;    }    return dnsResolveCachedIp;}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/e601785fb3e938eabd7bd756202f12544be57e80/nsProxyAutoConfig.js/buggy/netwerk/base/src/nsProxyAutoConfig.js