I've noticed that firefox seems to want to continually eat more & more memory, even if I close all tabs that I had open, leaving just two or three (earlier, I had about six tabs max open, now just two) open. Closing all that doesn't affect memory, though ...why does firefox eat more memory & not return it until it's completely closed?. I already apply tweaks which one digit member mentioned under tutorial section. I am using latest firefox 3.0+ with windows xp prof sp2.