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Can you update the version? I downloaded it and make the max version to 89 in the manifest.json and it works great ;) So I think you could also make this directly, would make it more comfortable to install it

Ta opinia jest o wcześniejszej wersji dodatku (1.0). 

I'm uncomfortable marking add-ons as compatible with a version of Thunderbird that I do not actively support. I only test on ESR releases as maintaining add-ons for all beta versions is more work than I can currently handle, especially as the add-on is free.

That beings said I'm glad to hear it works in 89 for you :)