Hello Marian,
I would suggest to post a BIG hint and a link to this thread (http://
groups.google.com/group/duplicate-contact-manager-for-thunderbird/t/
6609d6a57995e73e) also on your add-on page at AMO. There it will
probably be seen by most people.
I hope you find an successor.
Wish you all the best
famgoom