Google for Firefox reset. Reset your settings and see if it makes a difference Remember to backup your bookmarks and write down which extensions you use.
FF only uses 40mb RAM on my Vista Ultimate at the moment, I've only got myadsl open though
I usually have 4-7 tabs open and have noticed it's a major memory hog ... and have to close and restart it. I've not noticed anything with the CPU though.
Hah, I've had it open with about 15-25 tabs, half of which were Facebook pages and a quarter of it Youtube videos...if I leave that for a few hours it can get sluggish...
mine is fine mostly but i notice every now and then when i have multiple tabs open then when a page loads it sometimes freezes, maybe some scripts don't work well with it?