Mozilla has released Firefox 4 beta 1 candidate build. Mozila uploaded this build to its FTP servers for downloads. This version is just like as Firefox 3.7a6. Therefore Mozilla did not release any change log for this beta release.
Mozila’s latest Firefox build has still rendering problems in the menu bar on Windows Vista and D2D hardware acceleration is still disabled. But it includes enhanced support for HTML 5. On JavaScript side the latest Firefox beta is still lag far behind other rival web browsers as IE9, Chrome, Opera, and Safari.
Firefox 4 beta 1 is an early beta release and it requires a lot of work to reach to the final. Mozilla team is trying to hit the Firefox 4 with 500 ms as IE 9 is still below 500 ms.
For the users who want to try Firefox 4 Beta 1 then navigate to following link where it is available for Windows, Mac and Linux.