I had this issue with FireFox 3.5 today. After trying to login in with my correct password, the page would just refresh without actually logging me in.
I did have cookies for WSGF, deleted them, and then the login worked ok. I only just installed FireFox on the machine I was using though (my office PC) and I had previously posted using IE. So I think this might have been an issue of FireFox copying over my old cookies from IE (along with favorites and all that other stuff on initial setup) and the cookies not being compatible between the browsers.
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