Nicely Done. Rated 5 out of 5 stars

Nicely done. How about a TB? And I agree, regarding this, being your first theme. Surprisingly good. Thank you, very much.

This review is for a previous version of the add-on (1.0). 

TB version

Thanks PeteC! There is indeed a Thunderbird version called BloodThunder available in the sandbox here at AMO. Click the link: