Virya Cookie Monster is a Virya Software project intended to help Joomla! sites achieve compliance with the European PECR (otherwise known in the UK as 'the cookie law'). It presents either a banner of a lightbox, and can optionally give the visiting user the option to reject all cookies.
The module uses Joomla!s ACL system to help prevent cookies from being set. The extension also includes a script that checks installed extensions against a black-list to see if any are known to set cookies