I've been having this problem for a good 3 months now but just put up with it until now. I'm currently using Firefox 18.104.22.168 on Mac Leopard (was Tiger until 3 days ago). 1 out of 5 times that I visit Chowhound the formatting of the site goes haywire - things are just all over the place. After I visit the site and that happens, either Firefox freezes up or I don't have formatting on any other website that I visit after. Also, I can't quit Firefox after that (it just doesn't respond), I must do a force quit.
Any idea what's happening? I only blame Chowhound because it's always the first page to lose formatting and then everything goes downhill from there.