Rated 5 out of 5 stars

Very practical extension, does exactly what is expected. Permissions should be restricted though !

This review is for a previous version of the add-on (3.0.0). 

Thank you for your positive feedback!
Regarding permissions, please read this:
https://support.mozilla.org/en-US/kb/permission-request-messages-thunderbird-extensions#w_have-full-unrestricted-access-to-thunderbird-and-your-computer
As long as you download the Add-on from addons.thunderbird.net (ATN), you can be sure that the Add-on is safe.