Now there five main browsers in the market.
Apple Safari, Google Chrome, Microsoft IE 8, Mozilla Firefox, Opera.
If we just think about Windows platform.
Firefox has best web application compatibility. For web standards, Google Chrome and Opera are better support standards. Everyone knows that Firefox has a lot of Addons. So for extensibility, Firefox wins.
There are also some very important for users.
Performance, Opera 10 and Google Chrome are loading faster than others.
Platform Support, Firefox and Opera support Windows, Mac and Linux systems.
I do have IE on my Windows. I have Opera and Firefox too.
Among these three, I use Firefox most often, because of addons I need only working on Firefox. Sometimes I use Opera. Opera Unite is very cool.
What happen in next year.