Welcome to Firefox for Android Add-ons.
Add extra features and styles to make Firefox for Android your own.
CloseDeveloper reply by steva
Rated 5 out of 5 stars
For those that have this and want it for Tbird 52, go here
https://addons.mozilla.org/fr/thunderbird/addon/tt-deepdark/versions/beta
He has a beta version that works.
Thank you for helping me! ;)
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