I need to upgrade a Joomla 2.5 site to 3.x

The site uses a plugin "disable Mootools"

from this developer 
union-d.ru/

Is anyone using this plugin successfully on 3.3 or know of an plugin with similar functionality for 3.3?
Thanks- the developer is not answering my questions...

Is anyone using this plugin on a 3.x site with success?
Or know of another, similar plugin that works on 3.x?
Thanks!