Login Errors

Can anyone please tell me why it would be that someone couldn't log into their accounts anymore through Firefox? Is there something wrong with the site, or is it just a problem with the server? I know there's server maintainence going on right now, but I dunno if that has anything to do with it or not. As my sig can testify, I now have 2 accounts, simply because I cannot access my old one. Any and all information would be much appreciated.