|I completely agree with Mick. Stay off those sites and you'll avoid a lot of malware problems.|
This particular problem sounds like a poorly written script on the website is causing the browser crashes. Have you tried installing Adblock Plus in Firefox?
I suggest signing up for both the EasyList and the Fanboy's list. If you're able to decipher which particular script is causing the problems, you can use this add-on to specifically block it.
Apologies if I don't respond to your reply immediately. I don't check this site daily.