404 Message in Firefox

Recently I am not able to play on Firefox. I use the login screen, and the main lobby opens for a second, with the url http://atwar-game.com/play/#m. Then it immediately redirects to the following url, http://atwar-game.com/images/avatars/2/229177.jpg, without me touching anything, and I see this screen:



Any thoughts? It only happens to me in Firefox, not in Safari.

It happens to me if i get a notification from successful report and when i click on that link i get that message.Try to reinstall firefox,clear cache,clear cookies,clear silveright.You have details here how to do it
http://atwar-game.com/home/faq.php?chapter_id=5

If it doesn't help,i don't know what it could be the main problem.