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I'm using tb 78.12
when i try to connect using tbsync ui, a form appears with the correct google account, requesting to allow access to my contacts, but i cant click "allow" since it's grayed out.
after close this window, the log file just say "Browser window closed before the authorization code was retrieved".
account is defined properly in tbsync including id+secret retrieved from google cloud platform.

Questa recensione riguarda una versione precedente (0.1.7) del componente aggiuntivo. 

Thanks for Your report, but I strongly suspect there's some mistake in creating the Google Cloud Platform credentials: did You follow the how-to step-by-step?
Please email me privately.

Thanks.

UPDATE.
As per private tests, the "Contacts API" must *not* be enabled, as it would interfere with "Google People API".

UPDATE.
As per private communication, JavaScript must *not* be disabled in Thunderbird.