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On opening it now requires to log-in into your Google account. After having logged in, you need anyway to keep that window open, or your connection will be cut off. In that case, I think the only solution is to close and re-open Thunderbird.
It's a good add-on, anyway.

Это отзыв для предыдущей версии этого дополнения (3.1). 

I'd be interested to hear more about this via support. The login window should close itself after log in and it should be working then