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Unfortunately, does not seem to work on Thunderbird 78.8 under Fedora Linux 32. Edit: I put the version before: 78.8. This is the only thing I see in the console and it's a warning: "Layout was forced before the page was fully loaded. If stylesheets are not yet loaded this may cause a flash of unstyled content."

When I toggle the extension I get an error: "uncaught exception: Object"

Это отзыв для предыдущей версии этого дополнения (2.0). 

Hello,
Could you check what Thunderbird version are you using? Some of the older versions had issues. More info here:
https://github.com/fastaddons/Darko/issues/12

Also, does your other addons work?
Regarding my Darko - the code is very simple so there is not much room for errors. So if it doesn't work, it's most probably related to some issue in Thunderbird. You can also open Error console (Ctrl + Shift + J) and then press the Darko icon few times to see if there are some new errors being logged in. If yes, please send it to my support email and I will report it to Thunderbird team.
Thanks!.

Best regards,
Juraj Mäsiar