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Very nice extension but why does it need full access to my computer ?
OK as Portable App or on test machine but unacceptable on a production computer.
Is this a Security add-on or a backdoor ?

The reasons why the add-on needs full, unrestricted access to Thunderbird are described in https://github.com/lieser/dkim_verifier/wiki/FAQ#why-does-the-add-on-need-full-unrestricted-access-to-thunderbird.

Also note all versions of such add-ons are reviewed by another person.

It is understandable if you still don't want to grant the add-on such access.
But to imply malicious intend is a little rude.