I use Firefox 3 beta 5. Maybe it's double beta collision.

So I lost every game after crash connection. But one time, the man didn't know to need wait, and i get draw. 

Try Safari

They now have the Firefox 3 finished version out.

I've been using FF3 since it first came out w/o any problems.

Safari is the goods! never get troubles!!!

I've used firefox since starting on Chess.com and never had a problem