Because Firefox is an open source, other browsers can be based on it. It can also be ported to systems that Mozilla don't support (or have dropped support for), and it can be optimized to specific systems.
http://tenfourfox.blogspot.com/
PowerPC version (OS X Tiger, Leopard, Mozilla dropped support with version 4). Optimised versions for G3, G4 and G5Go to http://www.palemoon.org/ for a Windows version, optimized for modern processors.
http://www.riscos.info/index.php/Mozilla_Firefox RISC OS version (based on Firefox 2)
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