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: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/00bfeebbb2c14fd0a961592ee5a052c7dc4c0fb9/nsProxyAutoConfig.js/buggy/netwerk/base/src/nsProxyAutoConfig.js