Wikipedia
MicroB
MicroB is a mobile web browser developed by Nokia for use in smartphones and mobile devices that run the Maemo operating system. The browser is Mozilla-based and uses the Gecko layout engine.
It is shipped with Nokia's N800, N810 and N900 Internet Tablets, and is also available for the 770 via the ' Hacker Editions' of the operating system. In place of Mozilla's XUL-based user interface, MicroB uses the Maemo-native ( GTK-based) Hildon API and widgets.