Hello, Since I upgraded to Mac Os X Lion, I have a problem using Firefox with Facebook : whenever someone send me an instant message on Facebook, Firefox pops out and come at the front screen. For example, if I m writing something in mail, if John Smith send me "Hello", Firefox appears, so does the chat window. It's really annoying because if I'm trying to read something while having a discussion on FB, I'm interrupted... It happens whenever I'm on the main chat (any page of Facebook with the chat opened) or on the popout page (https://www.facebook.com/presence/popout.php), or even if the tab shown is another site. It happens with all version of Firefox (3, 4, 5 and 6), and only with firefox (tried Opera, Chromium and Safari ; don't have this problem). I haven't heard anyone having this problem, but now I have to use chromium for Facebook and Firefox for the rest of websites...