Review for Duplicate Contacts Manager by uhle89
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.
The language issue has been resolved in version 1.0.3.
To create your own collections, you must have a Mozilla Add-ons account.