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Does not work anymore with Thunderbird 63.0beta

Questa recensione riguarda una versione precedente (2.0.8) del componente aggiuntivo. 

That's correct. Release versions of Enigmail typically don't work with beta versions of Thunderbird. You have to use the nightly builds of Enigmail provided on https://enigmail.net/index.php/en/download/nightly-build