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CloseReview for Remove Duplicate Messages by Frits77
Rated 3 out of 5 stars
It worked perfect for me until the last update with Thunderbird 68.3.1, now it does not find any duplicates, even though there are a lot of duplicates
This review is for a previous version of the add-on (0.4.1).To create your own collections, you must have a Mozilla Add-ons account.