Hi, I've been using Firefox version 6.xx and previous versions for over a year using my MacBook Pro running OS X 10.6.8 to access my web-based email on www.comcast.net. When viewing my email, Comcast redirects me to a server named Zimbra. For the last 3 days, I've been able to access my email normally. However, when I attempt to create a new email or forward an email a new tile opens up (like normal) but doesn't fill itself in. It stays a blank white box. I switched to Safari and my email works normally. I contacted Comcast's email customer service and they are unaware of any Firefox problems. I'm emailing you because they are unable to escalate this internally. I'd appreciate any feedback as I use Firefox as my primary browser due to work issues. Thanks, Joe