On the Cardbook tab, click the 3-bar menu icon (upper left corner), Address Book, New Address Book, Remote, Google, enter your gmail address, then continue by entering the account password for OAuth2 authentication.

You could also add Google Contacts with the built-in CardDAV sync: in Address Book, New Address Book, Add CardDAV Address Book, enter your gmail address in the Username box, omit the Location (Contacts are autodetected), continue by entering the account password in the OAuth2 window.

"On the Cardbook tab, click the 3-bar menu icon (upper left corner), Address Book, New Address Book, Remote, Google, enter your gmail address, then continue by entering the account password for OAuth2 authentication."

Thunderbird > Tools > Add ons and Themes > Manage Your extensions I see Cardbook is Enabled BUT there is three bar menu button (Upper left corner) Thee is a three dots button to the far right however this only shows Manage or Remove. The is a tool button (Wrench) but this shows a menu with:-

General Tab Efition Advanced Communicate Custom Fields Lists Synxc Email Anniversary Help

NOT Addtress Book etc

Any more advice please?

Alan Farthing

To open Cardbook tab: press Alt if the Menu Bar is hidden, then Tools/Cardbook. Or, Ctrl+Shift+B. Or, add Cardbook button to the Mail Toolbar.