Firefox seems to have troubles displaying some web pages here. Especially long web pages.
You can see the troubles in the following video.
http://www.youtube.com/watch?v=cWqCoMENOOc
At the 26th second you can notice black bars displaying on far right and far left part of the screen, mixed with white bars, and at the end u can notice how the text overlaps and it's just weird, blackness, double text etc.
I have tried safe mode, clearing history, firefox on a virtual machine, firefox on my mom's labtop, same or very similar problems.
[edit] I was at a friend's house, tried it, the problem doesnt exist there :O