> Seamonkey no long update the PPC builds.

Latest update 2 days ago:
http://code.google.com/p/seamonkey-ppc/downloads/list

> Apple no longer patches/updates Safari for PPC either. [...] So the only browsers left
> being updated are TenFourFox and iCab for PPC Macs with OmniWeb questionable.

Leopard WebKit latest update 2 weeks ago:
https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=8287&forum=3&start=10