Here [1] are some builds of FireFox optimized for the Mac’s Power PC processor. I’m currently using Deer Park for the Power PC 7540. It renders very quickly, about the only thing I wait for is graphics to download. Impressive.
Beware! These are alpha releases, that is early working releases. Use at your own risk.
Couple that with the Adblock [2] extension and Filterset.G [3] filters and you got a pretty zippy web browsing experience.
(HT: Paulo [4])