Rated 3 out of 5 stars

by David von Oheimb on Jan. 1, 2019 ·

In response to recent requests/reviews:

The original developer has abandoned this add-on and has been unreachable for years. Since I needed some improvements I ended up doing them myself and providing a strongly improved add-on here: https://addons.thunderbird.net/en-US/thunderbird/addon/duplicate-contacts-manager/

This user has a previous review of this add-on.