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CloseReview for QuickFolders (Tabbed Folders) by treaclepumpkin
Rated 5 out of 5 stars
I've been using it for over two years now. It's an essential, so much easier to search a single folder for mail, or multiple ones, compared to the built in functionality.
This review is for a previous version of the add-on (5.7).To create your own collections, you must have a Mozilla Add-ons account.