Note: Mailing Lists in Thunderbird in Seamonkey are still somewhat buggy, especially when contacts are dragged and dropped into them.If you have read my previous blogposts, you will know that I love managing my services in Docker compose. See the support information for the details. If you find a bug or have a question, please let me know about it. Google requires these groups for every account, including Google Apps accounts where you can't see them online. If you choose to synchronize all contacts and groups don't try to delete or rename 'My Contacts', 'Coworkers', 'Family', or 'Friends' or you may have to 'reset' that address book. You may synchronize one account with several address books, synchronizing an address book with only one group of your choice, and can import contacts from Facebook and Twitter.

Please read the Developer Comments as well.

It is best to drag contacts into the main address book and add them to groups from Google's interface. If you change this the fake e-mail addresses nvalid are necessary to prevent bugs in mailing lists and are only stored in Thunderbird (they'll never make it to Google). By default 3.0.0 and later skip contacts without email addresses. *Important* NOTE: Mailing lists are buggy, but gContactSync tries to work around these bugs whenever possible. Questions and requests for help should be posted in the forum instead of a review.

You must enable cookies and allow JavaScript from in Thunderbird, not your web browser. Please read the FAQs before posting a review. It can synchronize the My Contacts group, all contacts, or all contacts and groups (with mailing lists). Synchronizes contacts between Thunderbird and one or more Google accounts. See my blog for details and instructions for TB 60 and 68. Thunderbird 68 should work with version 3.1.6 and later. 3.1.x is only for Thunderbird 67 beta and later. Use version 2.1.13 for TB 60 and earlier.

Thunderbird google contact sync