I'm still using the Monterail theme for Thunderbird [0], which sadly seems to have never really progressed beyond the proof-of-concept stage and hasn't been upd

I'm still using the Monterail theme for Thunderbird [0], which sadly seems to have never really progressed beyond the proof-of-concept stage and hasn't been updated in eight years. [0] https://github.com/spymastermatt/thunderbird-monterail/ https://github.com/spymastermatt/thunderbird-monterail/