Review for Duplicate Contact Manager by mlissner
Rated 3 out of 5 stars
This is a pretty good add-on, but since it's not functioning for TB3 yet, I wrote up a how-to so that people can do it another way. It's still pretty efficient all in all:
http://michaeljaylissner.com/blog/de-dup-thunderbird-address-book-contacts
To create your own collections, you must have a Mozilla Add-ons account.