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Have always like Noia. Description states a Black scheme option. How to install? Only see blue and gray options in Thunderbird. Thanks!!

Это отзыв для предыдущей версии этого дополнения (2.1.3.1-signed). 

Thanks.
You cannot access to the black theme for Thunderbird. I have worked on it but there is still a lot of bugs. So this is the reason why this option is hidden.