Add any code you like directly to your site. Has 3 sections for code insertion...
Just before closing HEAD tag
Just after opening BODY tag
Just before closing BODY tag
Use this to add tags or code such as Google Tag Manager, Google Analytics, Adroll, chat tools like ZOPIM, screen tracking, mouse tracking snippets, etc.
Works on all versions of Joomla.
Just install, add in your code, and enable!
We use it on our own site...