Apple's been working!
... Safari is using 750MB RAM while Firefox is using 1.8GB.)
Oh, oh....you'd better hide. I see grelber coming up the road waving a stick.
Nope. I'm happy (with Firefox) as a clam at high tide.
And not unreasonably in this respect; my RAM observation is merely informational, because, as joemike has explained, as long as your memory pressure is in the green range, what's using how much is inconsequential.