Android smartphones runs Firefox 4.0. It’s 3 times faster than Google’s mobile OS thanks to improvements in parts of the browser’s JavaScript engine. Browser controls are hidden when not used as it’s geared towards small touch-screens.
It has similar features to the pc version with extras including: sharing websites via various apps, access to 1000s of add-ons for complete customisation, HTML5 support including location-aware browsing, desktop notifications and full encryption.