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To make it work with Tbird 60.3.1, rename the install xpi of gContactSync to zip. Open up install.rdf and change the Thunderbird max version to 65.0. Then install extension from Thunderbird. It works again!

Questa recensione riguarda una versione precedente (3.0.0) del componente aggiuntivo. 

That works somewhat until TB version 63.0, then it will completely stop working. I'm tracking my progress towards supporting 63+ in https://github.com/jdgeenen/gcontactsync/issues/121. Thunderbird's rate of making breaking changes has outpaced my spare time, so your patience is appreciated.