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Honestly, when I saw the "needs access to everything on your computer" permission I was worried so I downloaded the code first and had a look through it. The code is really minimal, there's not much to it and the only thing it does is what it says.

Questa recensione riguarda una versione precedente (1.0.1) del componente aggiuntivo. 

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Further information:
https://support.mozilla.org/en-US/kb/permission-request-messages-thunderbird-extensions#w_have-full-unrestricted-access-to-thunderbird-and-your-computer