[wolf550e]

Can you build a modern browser to run on PPC? Say, latest fully patched firefox? Because using the browser that comes with Ubuntu 16.04 is not an option, security wise.

[mmphosis]

For Mac OS X 10.5.8 on PowerPC, there is even a specific G5 binary ...

http://www.floodgap.com/software/tenfourfox/

Otherwise for Linux on PowerPC, you can build a modern browser. There are also pre-built binaries:

https://forums.macrumors.com/threads/arctic-fox-web-browser-...