I’ve got some good news for your PowerPC machine! Recently (08/28/12) we got a new update for SeaMonkey that is very “very” helpful for all PowerPC users because it keeps our Macs up to date! Thumbs up for SeaMonkey and I hope to see this project advancing to further support the PowerPC world! Show them some love guys, they’re basically all we have left!
SeaMonkey 2.12 – Leopard/PowerPC (Keep your G4/G5 out of the closet) I loved this saying! – https://code.google.com/p/seamonkey-ppc/downloads/list