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CloseReview for ThreadVis by Joaquin Bravo Contreras
Rated 5 out of 5 stars
I like this better than "Thunderbird Conversations" because it uses the same and usual Thunderbird interface that just works. Thunderbird conversations sometimes hides attachments or shows emails formatted different from what you had configured. This one just works.
This review is for a previous version of the add-on (2.2.0).To create your own collections, you must have a Mozilla Add-ons account.