'Firefox add-on for coloring individual characters (synesthesia)

My daughter has synesthesia -- she can read better a text where each character has its individual color.

I have found the plug-in for Firefox named SynestheFox by Zoey. However, I need to add other non-English characters.

Being a programmer, I may be able to adopt an existing source code. On the other hand, I have no experience with writing Firefox add-ons. Is there any source code to begin with? Or any contact to Zoey?



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