Rated 5 out of 5 stars

yazan: Angelikasaah tarih: Şub. 24, 2014 ·

It does not work with Thunderbird 29.0a2.
Folder -> Remove Duplicates...
[JavaScript Application]
Not searching special folders.

This review is for a previous version of the add-on (0.3.9). 

yazan: Eyal Rozenberg (Geliştirici) tarih: Ağu. 22, 2014 ·

Try the beta please.