There are a number of light and dark themes available for Thunderbird.

Click on the get add-ons in the add-on manager and scroll right to the bottom of that page and click the see all complete themes on the right.

You might try filling a bug if you feel this is an important enhancement. https://bugzilla.mozilla.org/

This is already requested in https://bugzilla.mozilla.org/show_bug.cgi?id=1456219

Thanks for the info!

60.0b5 now ships with a dark theme

Wayne Mery said

60.0b5 now ships with a dark theme

So once you save the theme, how to you install it?

It only changes the theme of the perimeter parts of thunderbird, not even folder list or email list... I also can't find any dark theme addons that work with this beta version.

I am glad I'm not the only one seeing this. I hope a solution is found.

There is a problem with the dark theme.

When I send an email, the composing window does not who my To: email address. When I enter an email address, and change focus to type the message, the To: email address disappears. I cannot see it. This is the same with From: and Subject: The field title shows but what is placed into the field is hidden. These fields need to be set to black font.