Developer reply by Lab5
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!
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
To create your own collections, you must have a Mozilla Add-ons account.