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.)

Rated 5 out of 5 stars

Exactly what I needed to keep my contacts straight. Not too simple, enough functionality for a large collection of contacts in many lists.

This review is for a previous version of the add-on (1.0.5). 

Rated 5 out of 5 stars

Very clear and informative way of deleting duplicates across address books. I love it.

This review is for a previous version of the add-on (1.0.3). 

Rated 4 out of 5 stars

This Add On seems not to work, if you don't switch TB to English language. If you however do so, it works fine.
PLEASE PLACE A NOTICE IN THE DETAILS ABOUT THE ADD ON at least.

This review is for a previous version of the add-on (1.0.1).  This user has a previous review of this add-on.

The language issue has been resolved in version 1.0.3.

Rated 5 out of 5 stars

Worked smoothly, and actually came up with 15 duplicates i had overlooked. very efficient way to review and clean up.

Run it via option under the tools menu...

This review is for a previous version of the add-on (1.0.1).