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CloseReview for Extra Folder Columns by ilwe
Rated 3 out of 5 stars
Very helpful add-on. I really don't understand, why this functionality was removed from core TB ... Anyway: "As others have pointed out, this extension does NOT work properly with the "Smart Folders" view (inbox accounts are all listed as "Inbox" instead of the account names. Ditto for Sent, Drafts, and Trash). Hopefully that'll be addressed in a future version."
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.