Firefox 8

Firefox 8 (Stable Ver.)

For those who are using Firefox 8 and below(excluding Firefox 3.6), you might have noticed that the browser is usually using up your system memory/RAM, in other words, memory hog. - I experienced heavy lag with previous versions of Firefox, but once i've updated it to Firefox 8, the lag are gone and the browser is no longer using much memory.

http://www.mozilla.org/en-US/firefox/fx/

borrowed from Mafia-Wars-Maniac