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This is the best Thunderbird theme! Nonetheless, can it be modified? Specifically, can the light grey color on the Mail Toolbar and the light grey color when composing a new message be changed to a darker color?

*UPDATE 11/13/2018*
This theme is a awesome! Conema's assistance on how to change the light grey color on the Mail Tooblbar has been great.

Это отзыв для предыдущей версии этого дополнения (1.1.5). 

Yes, it can be changed by editing the userChrome.css[1] file. I received some complaints about that gray color, if you have some spare time, you could open an issue in GitHub for discuss a color change.

[1]https://support.mozilla.org/it/questions/1160703