In the past hour or so, I've been getting a connection interruption on Meebo's main chat. My connection is completely fine, but when I try and access the site again Firefox claims that the site isn't certified and is giving me warnings. I don't know what's going on, and my virus protection is up to date. Meebo is pretty safe, have been using it for a year now, so why would it keep doing this?

It's just really important, so if anyone could tell me why this is happening I'd appreciate it.