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Does not work with internal certificate autosigned.
There is no button to accept them, and the plugin keep notifing that the certificate is wrong, you have to kill thunderbird not very friendly. Waiting for the next version hoping this problem lasting will be solved

Это отзыв для предыдущей версии этого дополнения (0.14). 

This is not a plugin problem, but a problem of Thunderbird. Please see the FAQ on how to configure Thunderbird to accept self-signed certificated.