In the past I have used Mozilla Firefox. Then I installed Chrome, and dumped Firefox. On my Mobile Phone I use Opera. And from all of these I think that Google Chrome is the fastest and best browser.
Firefox is a (very) slow/bloated piece of software compared to Safari/Chrome. Going back to Firefox now is a very painful experience.
Both web browser are good compare to IE but they have their own specialties because when we said mozilla, that is a web browser that is tends to have a lot of plugins and aside of that it is very fast too but the factor that mozilla can't do is to have a lot of multiple tabs without being crashed unlike when you use the Google chrome browser, that tends to be a lighter type of web browser and can manage multiple tabs at the same time but what it lacks with that web browser are the plugins.
I prefer Chrome for browsing because it's fast. But for web creation I preffer FF because very useful plugins.
I used all browser - FF,chorme,IE ,,opera ..but I'm using opera since long time,,so would not use other browser again ...opera is the best browser ...