There are a bunch of add-ons out there to help you sync Thunderbird with your Google Contacts.
I want to share my favourite one with you.
Simply named, “Google Contacts”, this add-on automatically detects if you have a GMail account in your profile, and does the rest of the heavy lifting for you.
Honestly, it’s as easy as falling off a bike.
So a big thank you to the add-on developer, H. Ogi!