To use these add-ons, you'll need to download Firefox.

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Tignit n uzegrir

Iceggiren i automaticDark - Time-Based Theme Changer

automaticDark - Time-Based Theme Changer sɣur simonkhzhang

4,4 n yitran ɣef 5
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Icegger-it Kamui18
sɣur Kamui18, 5 jierren lyn
This is one of the best addons for Firefox.

Maybe a Release for Thunderbird 78?