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CloseReview for Extra Folder Columns by JuKra59
Rated 3 out of 5 stars
Absolutely great - however, unfortunately only for mail folders. For news server folders the number of items is shown ok but the folder size is displayed as "???" (Version 0.4, Mac).
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.