Review for MarkSubfolders by Matt England
Rated 3 out of 5 stars
Sometimes it worked, sometimes it didn't on my big, hairy, 2000-plug-folder tree. It saved me enough time that it was worth installing, even when I had to go manually "unread" subfolders it didn't catch.
This review is for a previous version of the add-on (0.0.2).To create your own collections, you must have a Mozilla Add-ons account.