I'm truly suprized people are even comparing them.
Firefox is many times more superior.. Soo much that I don't feel like I should even explain, as it should obvious to anybody thats equipped with hands, eyes, half a brain and an internet connection
just because FF is open source and it has lot of addons does not mean FF is better than Chrome.
Chrome is much faster than Firefox, better simple UI, also memory usage is lower than FF, and yeah it got good addons too.