add:  channel.loadFlags |= nsIRequest.LOAD_BYPASS_CACHE; 
context:     LoadPACFromURL: function(uri, ioService) {        this.done = false;        var channel = ioService.newChannelFromURI(uri);        pacURL = uri.spec;        channel.asyncOpen(this, null);    },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/b5c917a8b5e7de2b792b4d17c9727941e6fcdade/nsProxyAutoConfig.js/buggy/netwerk/base/src/nsProxyAutoConfig.js