I have used IE, and Chrome as well.
Firefox has a much larger array of options and customisations which it supports, not to mention that it isn't made by a major company like Microsoft, Apple, or Google. I had never heard of Mozilla until I got firefox.
That test does not show user friendliness, ease of use, and special features, which I would all rate 10 out of 10. This is where firefox makes up the gap in performance, which people hardly even notice anyway.
In the end I belive Firefox is the best browser because of how it focuses more on the users preference than on overall performance. Google Chrome can be as fast as it wants, but for users who don't really care about that, such as me, how user friendly is it?