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CloseReview for Duplicate Contacts Manager by DavidVH
Rated 5 out of 5 stars
Superb product - lost all of my Thunderbird contacts, but use Gmail, so they still existed, although without subfolders. Imported into Thunderbird as VCF, de-duped and edited 400+ contacts to 201 contacts in less than an hour. (gContactSync 3.0.x seems to broken, and Duplicate Contacts Manager filled the gap - and did much more.)
This review is for a previous version of the add-on (1.0.6).To create your own collections, you must have a Mozilla Add-ons account.