Rated 5 out of 5 stars

Excellent add-on, I was using it for a long time!
However, now I have to disable it, because of problems with correspondents column in thread pane.
When this add-on is enabled, arrows in correspondent column disappear.

This review is for a previous version of the add-on (13.1). 

This problem is fixed in Account Colors 13.2, which has been submitted to the Thunderbird team for review and release.

With Christmas and the New Year, it may take a couple of weeks for Account Colors 13.2 to be released.