Mozilla Firefox 4 Beta 1 is available for download. The latest version, Firefox 4.0, is expected to bring handful of design changes and performance enhancements that include tabs on top, aero support for Windows 7 and Vista and a new theme for Firefox 4. Beta 1 is available for Windows, Mac and Linux and can be downloaded from Mozilla FTP servers.

We had earlier posted about new UI and embedded downloads section for Firefox 4 that was revealed in screenshots. The enhanced UI has tabs on top, just like Google Chrome, Opera and Flock browsers.

Download:

• Firefox 4 Beta 1 for Windows
• Firefox 4 Beta 1 for Mac
• Firefox 4 Beta 1 for Linux