Can't watch .mov vids in firefox 3.5.3

I have an issue with my new firefox 3.5.3 (the latest one) - can't watch .mov videos like ones from apple.com. Also I can't wach apple keynotes and other presentations using quicktime x neither from firefox nor safari.

I'm running 10.6.1 + Firefox 3.5.3 (quicktime plugins included) + QuickTime 7 & X

Also, here's the list of my firefox plugins (if some of them may be the problem)


Please help me!