Rated 5 out of 5 stars

Without a doubt, these are the best skin series for Thunderbird and Betterbird. They maintain their integrity even when the mail client is maximized on a 16:9 (widescreen) monitor, where most skins break on the left of the top bar. Additionally, the color contrast is just right, Amazing. True that a grey logo will play better in the title bar

This review is for a previous version of the add-on (4.9). 

Thank you for your kind words. I'm glad you're using the theme and like it. I work on the theme myself, in my free time. I do this selflessly, but if you would like to support my work, please go to „Contribute” and make a small donation. Thank you very much.