add:  gFzFeedCache[url] = ""; 
context: Feed.onDownloadError = function(event) {  var request = event.target;  var url = request.channel.originalURI.spec;  var feed = gFzFeedCache[url];  if (feed.downloadCallback)    feed.downloadCallback.downloaded(feed, kNewsBlogRequestFailure);}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/19b2e713549ee61800b475b41ea511acb74caf23/Feed.js/clean/mail/extensions/newsblog/content/Feed.js