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There are a few browsers that work on Panther, however most, if not all are a decade+ old and don't support any of the modern web standards. I'm not sure whether RetroZilla is fully working on Panther yet but that will be/is the only modern browser for Panther?

Why not upgrade to Tiger or Leopard? You've got anywhere between a 1GHz and 1.33GHz G4 plus a Radeon 9200. Plenty powerful enough for either. Then you can run InterWebPPC, and so much more since Tiger and Leopard are the focus for modern PPC apps these days.
retrozilla is not really "modern," it is just old mozilla/seamonkey from over 10 years ago with tls 1.2 and some other little things added in. upgrading to tiger or sorbet leopard is the way to go for sure
 
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