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CloseReview for Remove Duplicate Messages by MikeZ
Rated 4 out of 5 stars
Abandoned or not, but this one did the job of cleaning out duplicates in the same folder without any hassle - the Alternate version did not manage to do it.
This review is for a previous version of the add-on (0.1.06).To create your own collections, you must have a Mozilla Add-ons account.