Assegnate 1 su 5 stelle

Great add-on, why on earth does it need access to my entire computer outside of Thunderbird?

you 've answered @ countDelinard:
"This add-on can not change, or even read, your filters.
It is nothing more than a shortcut to the Message Filters dialog.
Adding such functionality would require a completely different add-on."

If i have to get confidence about an addon with such a permission, puts the code on github at least...

The permissions are needed for this type of add-on, nothing I can do about that.
Check it on github: https://github.com/dillenger/filterManager