It's a little unfair to compare the two, since IE 7 requires XP SP2 or later to run, and Firefox 3 supports a much wider array of platforms. It's not like IE6 users on Windows 2000 (and there are still plenty out there) can upgrade even if they wanted to.
It's a little unfair to compare the two, since IE 7 requires XP SP2 or later to run, and Firefox 3 supports a much wider array of platforms. It's not like IE6 users on Windows 2000 (and there are still plenty out there) can upgrade even if they wanted to.