Rated 5 out of 5 stars

I really like the way it works and that it is highly customizable via userChrome.css.

But unfortunately it stopped working with TB20 (Earlybird). It now shows the size of the email instead of the name.

This review is for a previous version of the add-on (1.0.0). 

You can download a fixed version from http://www.ggbs.de/extensions/