Rated 5 out of 5 stars

Great theme. Thank you. When the right panel is active, there is however a small defect with the black color of the text (on a dark blue background) in the title areas of the "sidebar". (version 0.5.1)

Thanks for the review Phil_BZH.

There may very well be a number of colours and layouts that need fixed. I'm happy to take issues and pull requests on the repository (if possible) https://github.com/kaipee/thunderbird-theme-arc.