Rated 4 out of 5 stars

Excellent add-on. It makes TB so much more pleasant to work with, because I can colour code folders according to their purpose.
Five stars if it gets updated so that I can actually use it again!

This review is for a previous version of the add-on (1.2.5.2). 

While the new version on thunderbird.net is still in review and waiting for approval from the Thunderbird team, so it can go public here on this page, you can in the meantime download it from my webiste and install it manually : https://lab5.ch/colored-folders