Rated 3 out of 5 stars

Από τον/την Haeb στις Δεκ. 26, 2009 ·

Very useful, but buggy. Like user SternByName wrote, header line disappers after click on plus button. Only restart of TB gives header line again. TB 3.0 (BuildID 20091204171430)

Αυτή η αξιολόγηση γράφτηκε για παλιότερη έκδοση του πρόσθετου (1.1.4). 

από τον jmozmoz (δημιουργός) στις Δεκ. 27, 2009 ·

I have heard several bug reports of this kind. But I was never able to reproduce this problem. Could please post some more informations at the thread at mozillazine:
http://forums.mozillazine.org/viewtopic.php?f=29&t=1405155

Is this the first time, you installed this add-on? What other add-ons have you installed? Are there any error message in the error console (Tools->Error Console)? Does it work after the first restart of Thunderbird or does the error persist?