Rated 2 out of 5 stars

I played a lot with the settings and unfortunately I found still a lot mails as duplicate. They were the same, not attachements. Quite easy to find them even by eye. No idea why the settings don't work.

In some setting-cases the JavaScript stopped the work. Maybe it's my big postbox with ~10.000 mails (there are surely and easily much bigger possible) which is merged by some postbox versions which lead to duplicates or quadruplicates.

Then I tried the xpi-addin from Thorsten (which is warned as not compatible to current Thunderbird version). It serves more information and it's much more precise - AND it found all duplicates. Unfortunately you cannot resize the windows.

So my recommendation is - ask for the code of Thorsten and recode it for current thunderbird versions.

This review is for a previous version of the add-on (0.3.16).