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The Firefox 4.0 beta for Mac, Linux, and Windows is now floating around online and brings 64 bit support for Mac OS X.

This beta is definitely not for the casual user as it comes with a number of stability warnings and will probably be quite buggy till it reaches public beta.

If you want to check out the slightly cleaner UI, Chrome style tabs (Windows only), and impressive SunSpider Javascript tests, you can swing by the Mozilla nightly builds page and grab one of the “.dmg” files shown in the image above. The Firefox application itself is currently codenamed “Minefield”.

Download Link:

Windows – Firefox_Setup_4.0_Beta_1.exe

Mac – Firefox_4.0_Beta_1.dmg

Mac 64-Bit – Firefox_4.0_Beta_1.dmg

*This is beta version, so mainly for testing, We or Mozilla Foundation not responsible for using this.