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I like this add-on very much, thanks a lot! With charamel theme it looks much better with lightbird than without. Moreover, I made a new launcher with 'thunderbird --calendar' command so it can be launched as a stand-alone app, which is pretty neat.

One bug though: clicking in Edit>Preferences does not do anything. Do you have any idea about that? To edit preferences I need to go back to the main Thunderbird window (or open it if it wasn't), go to main Preferences and go to Lightning tab, which is a bit annoying but still a minor thing.

Thanks!

Could you open an issue on github about that? Thanks :)
Edit: it works fine for me, so please include info such as used OS and Thunderbird version, and possibly a log from error console