Use this script if you don't wanna show Adsense ads to users if they're coming from webmatrices.com
<script>
var allowedDomains = ['https://webmatrices.com/'];
if (!allowedDomains.includes(document.referrer)){document.write('<script data-ad-client="ca-pub-XXXXXXXXXX" async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js">'+'</' + 'script>');}</script>
