My current web browser of choice after having moved over from a 2 year long stint with Opera. Change is good, after all.
It’s got a memory footprint that could be be described as “reasonable” and handles multiple tabbed windows like a dream. FireFox is also one of the most standards compliant browsers out there, which is always a Good Thing :D
Beats crummy IE on ThatOtherOperatingSystem into oblivion and then some.