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Alexander, I really like this extension, but I have a question. I couldn't find any way to contact you via the extension home page. Is there a way that I'm missing?

Это отзыв для предыдущей версии этого дополнения (2.0.5). 

You can contant me in the German support forums (the forums interface support English language):
https://www.thunderbird-mail.de/forum/board/88-quote-colors/