Firefox 4 Beta 3 is made for handsets running under Google's Android operating system, or under the Maemo platform. This mobile browser is built on the same technology platform as Firefox 4 for desktop computers, just optimized for browsing on a mobile device.
You can freely download this Firefox 4 Beta by visiting firefox.com/m on your Android phone, or Nokia N900 (Maemo-running handset), just make sure that your handset meets the system requirements :) more details on this link
