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CloseReview for Remove Duplicate Messages by PigboyCrabshaw
Rated 5 out of 5 stars
This was always one of the most useful Add-ons, and I'm glad it's been updated for 78.1.1, where it works perfectly. I can't praise it enough, and kudos to the author for his work on it.
This review is for a previous version of the add-on (0.5b2).To create your own collections, you must have a Mozilla Add-ons account.