Another Webbrowser for Mac OS X 10.5 PPC - BrassMonkey
The Browser is called BrassMonkey and is a fork of legendary Wicknix's SeaLion from Linux. The version we are talking about is from Nov 2025 but was only available for Intel Mac 10.6 and got now his way to 10.5 PPC. It is also based on the modern UXP Engine like Powerfox (Link) is, and has a new updated code for even better compatibility with logging into websites. It also doesn't have a JIT Compiler, so script heavy sites will be very slow. But it is written that people on the MacRumours Forums are currently in the process of porting a JIT to Powerfox. Maybe it will also be available for BrassMonkey.
Currently, there is only the G5 Processor (970) supported.
I will give this a try so I fired up my Mac OS X 10.5 Install on my Powermac G5 and will see if it works.
Mac OS X 10.5 running BrassMonkey
It works great, I could also login to my Webmail and send this screenshot to my Apple Mail Account for further work. As I can see, it performs very well.