Thai Viet fonts for Firefox for Android. This add-on will install a set of Tai Viet fonts that enables proper rendering of the Tai Viet script on all sites (Facebook, Twitter, Google, etc.), regardless of whether a font has been embedded into the web page.
These addons were based on Mathieu Pellerin's Khmer Fonts Package
and developed with his advice and support:
The Tai Heritage Pro 2.5 font has been included. Tai Heritage Pro was released under the SIL Open Font License 1.1.
The font is available at http://scripts.sil.org/TaiHeritage