Rated 5 out of 5 stars

My duplicates came from a Thunderbird bug (almost has to be) where every couple of years all the messages in an account are duplicated for unknown reasons. When I found this it was great to be able to fix it it. You gave away your labor for free (thank you) so don't take these the wrong way but a few things:

1. The description of the add-on says good for Thunderbird 3 to 31 but we are now up to 52 so it wasn't even clear it would work - almost didn't download it.

2.On one account I rmb clicked on Inbox to set it as the next folder to remove duplicates from and then ran the remove. Worked fine. Then I went to the next account and rmb clicked on its Inbox and when I tried to run the removal it said it wouldn't search special folders. Both were pop3 accounts to the same ISP so it's hard to see where the difference would be. Eventually I just stopped trying to select a specific folder within the account folder and crossed my fingers and told it to delete without a selected folder - it seemed to work ok. It wasn't clear which folders it was selecting to work on though - scary!
Then out of curiosity I went back and tried to repeat my actions on the first folder and this time it complained about not searching special folders...???

3. It seems to automatically compact after removing duplicates... would kind of like opportunity to decline that.

4. Some comments reference documentation... I'm not seeing any documentation.

Overall it did the job so I'm grateful - thank you!

This review is for a previous version of the add-on (0.3.12).