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CloseReview for Extra Folder Columns by FreudSlipped
Rated 5 out of 5 stars
Thank you for restoring something that I consider an essential "good housekeeping" tool. Why they dropped this option from the official release is baffling, to put it mildly.
This review is for a previous version of the add-on (0.4).To create your own collections, you must have a Mozilla Add-ons account.