SeaMonkey doesn't have a Thai language pack, but Firefox does. Opera has built in support for Thai, too. If you guys would rather use Chrome, remember it isn't suitable for old computers.
Here's Firefox 14.0.1 compiled by Tman:
http://www.smokey01.com/Tman/apps/firefox/
Here's the Thai language pack extension for Firefox 14.0.1:
https://www.dropbox.com/s/gic7qt7xg7wun6l/th.xpi?dl=1
Locale_switcher extension, required to be able to change language:
https://dl.dropbox.com/s/kydjbl7simp3iz ... x.xpi?dl=1
How to set Firefox to your language:
https://www.dropbox.com/s/eizvwe3fhmca1 ... nguage.txt
Dependencies (for those who use Wary) and more language packs:
https://www.dropbox.com/sh/a2n6emd3t3olh0x/Hjy8Bod_ta
How to translate Puppy into Thai language?
I made a .pet with the Thai fonts. You can also read Lao language with them, for both languages use the same writing system:
https://dl.dropbox.com/s/fkg36i6oxrchkz ... f.pet?dl=1
https://dl.dropbox.com/s/fkg36i6oxrchkz ... f.pet?dl=1