There are currently several sites I visit regularly -- as part of work, mind, so these are professional business sites not bleeding edge web geek blogs -- that will crash Firefox.
Have you filed bug reports for those crashes? Care to share more information about the websites that cause them?
I'm serious, I can try to help get those bugs resolved.
The IQ of the group is the lowest IQ of a member of the group divided by the number of people in the group.