Rated 3 out of 5 stars

Using gContactSync, I synchronise my contacts with Google. This does not identify duplicates automatically, but it does make it easy from Google contacts to merge two partial records for the same contact (e.g. the e-mail is in a record, and the phone number and mail address in another).
Since I switched to TB3, I had to abandon Duplicate Contact Manager...

This review is for a previous version of the add-on (0.6).