Have you tried this latest beta version of Firefox? Yes, Firefox 4 is a really beautiful browser. The interface is simpler and more elegant and almost alike Opera 10.
Firefox 4 on Windows 7
Some major changes in Firefox 4 are
1. Tabs are now on top.
This new interface by default on Windows only. Linux and Mac OS can support too depends on theme used.
2. New firefox button (the orange button)
The design of this button almost as like as Opera 10. All of old Firefox options comes here. Unfortunately, you can only get it on Windows Vista and Windows 7
3. Much more improvements
Try it and you will notice other improvements 
Download Firefox 4 Beta 4 For Windows
Download Firefox 4 Beta 4 For Linux
Download Firefox 4 Beta 4 For Mac OSX
Boo, that looks like Chrome. I hate Chrome.