Classilla

Classical is a of the  for classic Mac OS, which is no longer supported by Apple nor the Mozilla Foundation. It is maintained by Cameron Kaiser for obsolete Macs, though officially in an unsupported capacity.

System requirements
Classilla will run on any PowerPC-based Macintosh with 64 MB of RAM running Mac OS 8.5 or later. However, a PowerPC G3, at least 128 MB of physical RAM, and Mac OS 9.1 or later are strongly recommended.