评分4星,满分5星

Does not work anymore with Thunderbird 63.0beta

这个评论是针对附加组件的一个早期版本的(2.0.8)。 

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