It's been a loooong time since I've been able to browse download.cnet.com without having Firefox freeze on article pages. Something's very nasty on that site (or Firefox/one of the plugins I use is very bugged). Some guy on
mozillazine suggests to enable cookies from cnet.com, but I'd rather not: there must be another way
Anyway,
AdBlock comes to rescue. Just add a filter blocking
http://*.i.com.com/*.js and the problem vanishes.