Rated 3 out of 5 stars

Walnut for Thunderbird 2.0.32 is a step backward. The Add-ons Manager window is inexplicably now much too narrow. As a result, the printed description of each item is all scrunched up such that the content of each field intrudes on the columns of other fields. Had to shake my head at the claim of "improved main window styling." Certainly not the case with the add-ons manager window. And there is now so much wasted space to the right of the add-ons window. Please restore the full width display of previous versions.

Furthermore, this theme no longer plays nicely with the add-on T-Bird Titlebar Tweaker. The minimize button, close button, and other buttons in the upper right corner no longer function. I suppose the author of that add-on will be responsible for fixing that problem with a subsequent release, but I cannot help but ask: why is all this necessary? So many additional problems for so little net gain.

Unfortunately, this is becoming all too common with Mozilla products. After many years, I have finally dumped Mozilla's Firefox for Opera and Chrome. Guess I'll now have to start looking for an email alternative to replace Thunderbird. Sigh...

This review is for a previous version of the add-on (2.0.32). 

If you send me an email than I can forward you a version to test.
(Click on the Support E-mail link on the addon page: https://addons.mozilla.org/en-US/thunderbird/addon/microthunderbird-for-thun-1657/)