I've been a bit remiss re my PPC Macs: The MDD dual 1.25 GHz G4 hasn't been run since March, according to its Time Machine backup. TenFourFox v45.4 now loaded onto both its Leopard & Tiger HDs. 1Password updated also. Both the 1password .pif file & the TFF zip files have ben loaded up to my iCloud drive, where previous versions of TFF can access them.
The MDD G4 works quite well on the internet as it connects to my broadband router via Gigabit Ethernet.