Rated 5 out of 5 stars
It is a great add-on. I have been using with TB 17.x and works great and helps a lot to control the number of emails and the unread ones from the total.
However, I have just moved to PostBox, similar to TB, several TB add-on work on PostBox just tweaking the rdf file however, this add-on -although I can install it- it does not show any information.
It would be great to make it possible also in PostBox. Thanks!