Firefox has already outperformed against all the other Web Browsers already by releasing its Beta 4.
Previously the speed list stood as follows:

1. Firefox 3.0 Beta 4
2. Safari 3.1
3. Opera 9.50 Beta 1
4. Internet Explorer 8 Beta 1
5. Firefox 3.0 Beta 3
6. Safari 3.0 Beta
7. Opera 9.26
8. Firefox 2.0.0.12
9. Internet Explorer 7

Now yet again they come up with Beta 4, which performs even better.

Courtesy: www.zdnet.com (http://blogs.zdnet.com/hardware/?p=1648)