Firefox isn't acctually all that good, I find it stupidly slow and it slowes down apsolutaly everything else your doing. Mabye Everyone else got a differant version from me (twice), mabye they just don't like me and put mine on "Shitt Mode" or mabye I'm downloading the wronf firefox (assuming there are more than one) but in m experience Firefox is absolutaly bolloks.
Internet Explorer for me, it works, it comes with the PC, it doesn't slow down your computer, it's fast, reliable and i like the way it looks.
Mabye it's all down to personal preferance, mabye it's some crazy kidish fad going round internet users (almost everyone) like... pokemon or something or mabye it's some phycological thing were so many people have told you that firefox is good and IE is rubbish that you acctually believe them despite how the two things act. Anyway that's my experience with those 2 browsers.