Review for gContactSync by Will
Rated 5 out of 5 stars
Worked perfectly, I have names, email addresses, addresses and multiple phone numbers for many of my Google contacts. I set the sync to read only so I update contacts through Google still to be on the safe side. The sync pulled all the information down as expected into Thunderbird's address book. I would recommend downloading a CSV dump of your contacts before trying this for the first time.
This review is for a previous version of the add-on (1.1.2).To create your own collections, you must have a Mozilla Add-ons account.