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A fork of Firefox to maintain support for the Power Mac, supporting Mac OS X 10.4 and 10.5, with special features and optimizations for PowerPC processors and AltiVec. New technologies at the heart of the system make your Power Mac more reliable, capable and responsive —and lay the foundation for future innovations. TenFourFox FPR also refines the websites and services you use every day. It’s TenFourFox at its highest level yet.