Mozilla releasing its long awaiting version 4.0 of Firefox browser. Eager to use the new Firefox 4 then you can get it on Mozilla FTP servers.
Use the following direct links to obtain latest Firefox 4.0
Windows -> Firefox Setup 4.0.exe
Linux -> Firefox‑4.0.tar.bz2
Mac -> Firefox 4.0.dmg
And the Firefox came with a lot improvements and support to HTML 5 and CSS 3, It scored 255 out of 400 when pointed Firefox 4 towards html5test.com