I guess I should answer here. :) I think that permission system of Mozilla's addons is useless. It's possible to do something bad with almost any of these permissions. And a people who will check permissions before clicking "Yes" are just paranoids. I mean nobody will check permissions except few people even if we speak about software developers. All what this system does is spend software developer time. Checking security of addons is Mozilla's job not users.

If I have enough time I will fix this and delete exaggerated permissions.