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gContactSync
Requires Restart
Synchronizes contacts & groups between Thunderbird and Google Contacts.
15,471 users
Duplicate Contacts Manager
Requires Restart
This Thunderbird add-on searches address book(s) for pairs of matching contact entries.
It can automatically delete entries that have equivalent or less information than the other one.
Any remaining matches are presented for manual treatment.
1,082 users
To create your own collections, you must have a Mozilla Add-ons account.
