add: if (feed.downloadCallback) feed.downloadCallback(nsnull); } 
context: Feed.onDownloadError = function(event) {  // XXX add error message if available and notify the user?  var request = event.target;  var url = request.channel.originalURI.spec;  var feed = gFzFeedCache[url];  if (feed)    debug(feed.title + " download failed");  throw("error downloading feed " + url);}
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/5ef0114af1c3072cc921d2675b697d8ddaf8ef09/Feed.js/buggy/mail/extensions/newsblog/content/Feed.js