Disables JSONP access for the YOURLS API. Might be a good idea for private installs that don't want any sort of public access to the API (even though you would still need a user/pass or signature for requests.)
Move the disable-jsonp folder into the /users/plugins folder. Then, activate the plugin in the admin interface. That's all there is to it.
User must have YOURLS 1.5.1+ installed.