Alright, Firefox basically is Open source, allowing people to
edit the code, and thus it is much more secure. Also, this makes it
have better features such as using less memory, and it is also
much, much faster than Internet Explorer. If what you are going for
is speed, and you have a considerable amount of space, You might
like Safari, which is very slightly faster than Firefox.
However, Firefox has addons and you can program it to your needs
and specifications using Greasemonkey. So who reigns supreme? In my
view, Firefox owns every other browser. Also, it won a guiness
world record for most downloads in a day.