This extension will check web content and convert to Unicode encoded text if they are Zawgyi.
MUA Web Unicode Converter is en extension for Myanmar Unicode User. The main functions are -
* Detect Zawgyi encoded text and convert automatically to Unicode encoded text
* Fix Zawgyi font embedded web site to display Unicode text correctly.

This extension is freeware and source code can be found here.

https://github.com/thantthet/MUA-Web-Converter-Safari

This extension
- based on Myanmar Font Tagger
- used Parabaik converter script.