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от Murillo Deza Янв. 3, 2019 ·

Why this extension is not working on this latest version of thunderbird?

Это отзыв для предыдущей версии этого дополнения (3.0.0). 

от Josh Geenen (Разработчик) на Март 10, 2019 ·

It wasn't working because it is difficult to keep up with the rate of change in Thunderbird. They keep removing features that gContactSync uses, and don't have updated documentation to help add-on developers migrate to newer versions. Version 3.1.4 should work better, but requires TB 65 or later, which is still in beta.