channel.asyncOpen(listener, null); 
channel.asyncOpen(listener, null); 
    loadAsync: function(url, cb)    {        if (url in this.cache)        {            cb(this.cache[url], url);            return;        }        var ioService = IOService.getService(nsIIOService);        var channel = ioService.newChannel(url, null, null);        channel.loadFlags |= LOAD_FROM_CACHE | LOAD_BYPASS_LOCAL_CACHE_IF_BUSY;        var listener = new StreamListener(url, this, cb);        channel.asyncOpen(listener, null);                }, 
2454	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/2454/e1d42ad3fad63b72826a4e2ed0726866484c9ac3/sourceCache.js/clean/extension/content/firebug/sourceCache.js