I did not know Mozilla could remotely disable addons. It sounds like the user has the ability toÂ override this behavior, so that's good. Still, I don't like the idea that developers can remote control what their users can and can't do with their apps. If Mozilla decides to use this power for evil, many users will be unable to figure out how to re-enable their addons. Of course, the more tech-savy users will always find a way, but people who don't know too much about computers will be driven away from their addons of choice.
In any case, it's not too likely Mozilla will do any such thing. Given their history of being pro-freedom, it's unlikely they'll disable addons that don't violate the users' freedom.