Review for Advanced Unread Folders by blueduck
Rated 2 out of 5 stars
This add-on cannot remember the options you select (v 17.0.6), which makes it less useful in seeing what you'd prefer not to see. I'm pitching it because it does not offer a convenience.
This review is for a previous version of the add-on (2.0).To create your own collections, you must have a Mozilla Add-ons account.