TenFourFox G5 is a version of the Firefox web browser designed to run on PowerPC-based Macs running Mac OS X 10.4 (Tiger) and later. It[SQ]s a continuation of a project aimed at keeping a relatively modern web browsing experience available on older, unsupported Apple hardware. "G5" refers to the generation of PowerPC processors found in many of the Macs this browser was designed for. Essentially, it[SQ]s a niche browser for a very specific, retro computing audience.