Wow, that sucks. This site has never been any trouble for me, but it sounds like something nasty crawled into your comp.
I dunno, try IE and see if it fares any better. All antispyware and antivirus programs updating? Reinstall Firefox? Did you unplug the comp and plug it back in...? Grabbing at straws here.
Be considerate to others or I will bite your torso and give you a disease!