Well then this script obviously isn't for you LilJonny. But there are a lot of people who do find the chat bar annoying and would like to block it. That's why this script has been installed 400+ times already.

I updated the script since Facebook changed their code today.

Hey Adam, I like your idea but that sounds like a LOT of work. I really just make these scripts for myself and then upload them as kind of an afterthought.
Since I don't intend to use the chat feature at all I don't really have any incentive to spend all that time making it work like you said. But I'm sure someone else on here could. Sorry about that man.