As you can see in this screen clip -Firefox 2 is a HUGE memory hog! I had the exact same website’s and number of tabs open in each browser – Flock 0.7.9.1, Internet Explorer 7.0..5730.11, and Firefox 2.0.0..
All of the browsers stayed open over night, and FireFox constantly consumed more and more memory – even though I wasn’t doing anything with it – it was just open to some static web pages. Click the image for a larger view.
But if I close Firefox and re-open the same tabs and web sites, it’s memory footprint is much smaller – but it grows and grows over time.