Why is this TenFourFox and not Firefox?
Because even though it uses the Firefox code base, it’s not Firefox. It uses code tuned for 10.4 (and compatible with 10.5), adds new PowerPC-specific improvements and restores the glue necessary to get most of modern Firefox’s advanced features working on our older computers, offered in separately hand-tuned builds for G3, G4/7400, G4/7450 and G5 processors to get the most from your specific computer.
TenFourFox requires a G3 Power Macintosh, Mac OS X v10.4.11 or Mac OS X v10.5.8, 100MB of free disk space and 512MB of RAM. Video playback will be poor on systems slower than 1.25GHz; we recommend a G5. Intel Macintoshes are not supported (and will be mercilessly mocked).
Remember, TenFourFox is free software, “as is” without warranty of any kind, including merchantability or fitness for a particular purpose. There is always the risk of system instability, data loss or security compromise. You accept these conditions unconditionally by downloading and using TenFourFox. Use TenFourFox at your own risk. Find out more about the Mozilla Public License and other licenses governing this software.
Download TenFourFox Browser at Official TenFourFox website