Firefox has been my favorite brower for the past year or two but upgrading to the latest 1.5 is starting to change that. Looks like the latest release has a big problem with memory leaks. I have browsed on previous versions for hours and hours and not even a single crash but the latest 1.5 has been crashing way too often. There have been times when I have seen it using about 200MBs of RAM! This is insane considering that I only had four of five tabs open none of which had anything that would require any special memory considerations.