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Unfortunately the Add-On only works partially for me!
- missing selection: delete all mails, leave one left (per mail)
-a folder with four mails of 3x each exists, but only each mail is found twice
- now delete the found mails
- then a new search
- but there are still two of each mail (4 pcs.) available
There are also other combinations of not found mails!
macOS 10.15, Thunderbird 68.2.0, Remove Duplicates 0.4.1