Mozilla Firefox is a graphical web browser developed by the Mozilla Corporation and a large community of external contributors. Performance is apparently really fast, although they do caution that video playback will be poor on PowerPC Macs that are slower than 1.2GHz. System requirements to run TenFourFox are a PowerPC G3, Mac OS X 10.4.11 or Mac OS X 10.5.8, 100 MB of disk space, and 256MB of RAM. Firefox has replaced the Mozilla Suite as the flagship product of the Mozilla project, under the direction of the Mozilla Foundation. Firefox started as a fork of the Navigator browser component of the Mozilla Application Suite.