Maybe my FFpx needs tweaking then but the way I browse sometimes locks it up..
ie.
I'll goto the new posts menu on the forums, then open the ones I wanna read in a new tab while staying in my original tab if theres more than 1 page of new posts, when theres no more new posts I'll use my original tab to open the new forums until I've got everything I wanna read open..
Slows down my machine at home as well as my work machine...