1.5GB, 1.8 single core pentium M processor.
(Work laptop), I might just request a new laptop cause this ones a little old and past it now...
but I doubt that I'll be going back to firefox unless it's for a specialist task.
I've had isues in the past with memory usage, seriously, I've had firefox, with five tabs open using over 1GB of memory on it's own!
after I installed the latest version I found that memory use was fairly constant at between 300 - 400 MB, but processor use would just go through the roof...
if just a browser FFS. I miss the spell checker, but so far IE8 has been pretty good, takes less resources, but to be honest, if I need to do something that I'd previously got a plug in for, I can go back to firefox, I do get annoyed at the little differences the stop button, refresh etc have all moved,
one thing that I am liking is being able to go back to pressing alt + s to submit a post. (I'm a bit fan of keyboard shortcuts).