Review for Show InOut by Igor Belgrade
Rated 5 out of 5 stars
Everyone who mixes messages in one folder must have this extension. It is very nice designed and very intuitive for use. I quickly switched off columns sender and recipient that took me so much space on messages list.
This review is for a previous version of the add-on (0.4.0).To create your own collections, you must have a Mozilla Add-ons account.