Faster, more secure, easier to use, more customizable, free and doesn't belong to Microsoft - for a start.
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I've got not probs on my XP2 PC, but my Vista laptop hates it. 50% of the time, it gives the old blue screen of death when Firefox opens up.
I have had a few auto updates for Firefox in the last few weeks.
After the first one or so when I clicked on an internet shortcut it would bring up a Firefox error (but still load the website and run fine) and bring up a blank IE7 window as well.
All seems to be okay now though.