FireFox isn't so bad though Red. My PC is old and slow, and did fine downloading and using FireFox. I actually like FF better than IE, now that I've gotten used to it.
It's an unfortunate side effect of the current issues with Chat. Hopefully Heath will have it fixed sometime soon so everyone can play with their browser of choice.
Chat doesn't work on Internet Explorer
Chat does work on FireFox (for most people), Safari, and Opera
Chat no longer shows how many people are in a room