So it's a clear problem that MANY have... saw it on Quora/Stack Exchange/Firefox Forums to name a few... So it's really simple, i have a new profile, no extensions, no plugins and i only have 3 tabs open (Google Mail, Google Reader, Facebook) but Firefox seems to be needing more than 720 MB... I'm sorry but that's just ridiculous... The browser is still fast and responsive, but why would it need 720MB? ... i saw my Firefox go to 1GB if i left it open for more than 3-4 days... that's just no acceptable. I love Firefox and don't want to change but it saddens me when other newer browser (Safari/Chrome) can keep memory usage under 300 MB