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CloseReview for quickFilters by Tomgeorge
Rated 4 out of 5 stars
A great add on which I have used for years. Unfortunately, it is not compatible with the current Thunderbird 60.0b1. Hopefully, an update is in the making.
This review is for a previous version of the add-on (3.4.2).To create your own collections, you must have a Mozilla Add-ons account.