Rated 5 out of 5 stars

Thank you. it works really well and now Thunderbird follows the system theme for real.

Rated 2 out of 5 stars

Text on the tabs is to dark. Same for minimize, maximize and close buttons, they are to dark.

Rated 4 out of 5 stars

Very clever! But I regret to see that the button "compoze new email" and the buttons on the left vertical bar are still blue. That would be nice, if those followed the accent color too!

Rated 4 out of 5 stars

Wow, this is pretty nice!

Using with KDE/Plasma on openSUSE, and it does exactly what it says on the box.
It follows the GTK theme of course, but the result is a very quick and simple way to make TB115+ look like it really belongs.

It does nothing for the icons (not a big surprise), but it does its main job well.