I personally chose Firefox for the simple fact that if your a programmer and or a graphic designer and lets just say....your building a simple or advanced web page or site, Firefox helps you out ion the details and sometimes points out the errors. Ive experienced the diffrences between this and Internet Explorer, where it just looks like you actually didi a great job completley, but again, Firefox, if you look at your work on there, you can see what errors you have, if any.
I love using Firefox, I use to use it on my PC. Imagine how pleased I was to discover, I could also get it when I made the move to Mac. It's so easy to use & looks great too (that's a girly thing).