The other problem is that it's not possible to request (as an extension author) or give (as a user) fine-grained permissions to extensions. You're only able to

The other problem is that it's not possible to request (as an extension author) or give (as a user) fine-grained permissions to extensions. You're only able to request very coarse permissions, often it's either you're giving up an insane amount of control over to extensions or the extension isn't allowed to do anything useful.