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SeaMonkey for PPC is a Web browser that shares much of the same base code as the popular Firefox Web browser. It also contains an advanced e-mail and newsgroup client, IRC chat client, and HTML editor.

Since Mozilla has stopped supporting PPC on Macs, I have picked it up and provide the only SeaMonkey version runnable on G4/G5 based Macs.

The SeaMonkey project is a community effort to deliver production-quality releases of code derived from the application formerly known as "Mozilla Application Suite". Whereas the main focus of the Mozilla Foundation is on Mozilla Firefox and Mozilla Thunderbird, our group of more...

What's New

Version 2.26: Release notes were unavailable when this listing was updated.


OS X 10.5 or later

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SeaMonkey for PPC User Discussion

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Waycoolphil Member IconReview+0

Thank you. Version 2.24 is working well now.

Reply0 replies
Version 2.24
Waycoolphil Member IconReview+0

This version (2.24) won't even launch. I removed it and reinstalled 2.23 and it works fine again.

Reply1 reply
Version 2.24
-hj- (Developer)

yes - sorry

seems that there is a problem with the Library references i create copy and modify to make it SeaMonkey a self contained package.

It escaped my quick test after a compiler upgrade
i made on my development system here.

It may take a couple days to sort out and get a new executable as i cant devote myself to this 100%

Virtualruffy Member IconReview+211

This is terrible! I use Sea Monkey and have been stuck at lower versions. I upgraded to 10.5 and to this. WTF! This is so unbelievable slow I want to shoot myself in the head. Everything hangs! Everything fails to load on pages (images) or overwrites the same area -it's like it has no clue how to handle webcode!

I switched back to the older version and everything is fine (no changes to the preferences of the browser). My system is in perfect working order (repaired permissions, diskwarrior cleaned) but this browser version STINKS! And from reading the other reviews seems to be consistently BAD! This should be called SeaTURTLE because that's it's speed.

If you are considering downloading this...DONT! You'll regret it and be posting like I am.

Reply0 replies
Version 2.23
Jazzyguy Member IconComment+3694

Try 2.10 on the developer's download page.It is faster and loads my password quickly in mail.

Reply0 replies
Version 2.22
Jazzyguy Member IconReview+3694

Extremely slow on my iMac G4 running Leopard.It took 5 times in the mail app before it accepted my password for Mail.It was so slow I had to force quit it.

Reply0 replies
Version 2.22
Macarone Member IconReview+5

Kills the very popular utility iGlasses.

Seems even slower, not faster than FireFox 3.6.28, which DOES support iGlasses.

Reply0 replies
Version 2.21
Dp-G4-450guy Member IconComment+73

Will this start under 10.4 at all or does it require 10.5 Finder?

Reply2 replies
Version 2.17

I tried running this under OS X 10.4.11 on a G5 2 x 2 GHz system. The application immediately reported it couldn't be opened on that version of the Mac OS. On the same hardware, the browser ran fine under OS X 10.5.8.


If the creator says that the minimum requirements are 10.5, then you ought to listen to him/her.

Rardin Member IconComment+35

For those like myself who were having issues with SeaMonkey-ppc 2.15 and later failing to start with a symbol not found in libstdc++ error message, hiker.x.biker has resolved the problem by incorporating into the SeaMonkey-ppc distributions the libstdc++ and libgcc libs against which he is compiling. This will be the case for all releases moving forward.

Reply0 replies
Version 2.16
Just Fred Member IconReview+24
Just Fred

Allow me to add my appreciation and thanks to the developer. While I have (slowly) moved from a G4 PowerBook to a MacBook Pro, my old, trusty G4 still works as a streaming audio server and as a utility backup machine.

The SeaMonkey for PPC has revived a machine that could no longer operate well in today's web space. It's fast, reliable, and does everything I want it to. Kudos!

Reply0 replies
Version 2.14
Milmascaras Member IconReview+13

Thanks You for this! : I pulled an old eMac out of the closet, and gave it the old maximum update and performance treatment, wiped/reinstalled selectively, pruning old, hacking anew, and was very pleased with the performance of SeaMonkey, including ability to use some modern extensions. This brought back positive memories of Netscape Communicator, and Firefox and Thunderbird combination, and feels quite uptodate in just about every way. Good Job!

Reply0 replies
Version 2.13.2
user icon+0
Version 2.16.2
user icon+442
Version 2.13.2
> 3 10


Current Version (2.x)


Downloads 6,199
Version Downloads 295
License Free
Date 07 May 2014
Platform OS X / PPC 32
Price Free
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