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I assume the add-on works just fine, but before installing it, a simple question - why does it need a permission to "Have full, unrestricted access to Thunderbird, and your computer"? What does it mean?

这个评论是针对附加组件的一个早期版本的(2.16)。 

With TB78 the extension system changed towards MailExtensions which only allow access to TB via a subset of APIs. Those APIs are currently not enough to build TbSync. I therfore use a special API which gives me full access like I had with legacy extensions in TB68.