While many people are aware of Firefox and it's uses..
not many are aware of Opera.
When i first stopped using IE, i switched to Firefox. I used Firefox for a few years. Just got tired of installing, and reinstalling all of my Extensions/Plugins.
Then i tried Opera. i fell in love with Opera. Im not here to try and convince anyone which is better. but for my uses, Opera has so many more features that make it extremely convenient to use, transfer to another computer, and install.
It's fast, light footprint, and extremely secure.
The only downside of Opera when compared to Firefox was that it lacked extensions/plugins.
Well.. Opera 11 now has 'extensions' !
And if you're a Windows Enthusiast like me, and anal about performance, then you'll enjoy the Portable version:
Extensions available here