It was originally first released for the Nokia Maemo operating system, specifically the Nokia N900, on January 28, 2010.[174] On March 29, 2011, an Android version was released, being based on version 4.[175] With the release of the mobile version, the browser's version number was bumped from 2 to 4, synchronizing it with all future desktop releases of Firefox because the rendering engines used in both browsers are the same.[176] Version 7 was the last release for Maemo on the N900.[177]