XWiki render MathJax without extensions

Go to https://WIKI.YOURSITE.COM/bin/admin/XWiki/XWikiPreferences?editor=globaladmin&section=Presentation and add the following to "HTTP META INFO" header at the beginning:

<script type="text/javascript">

  MathJax = {

    tex: {

      inlineMath: [['$', '$'], ['\\(', '\\)']],

      displayMath: [['$$', '$$'], ['\\[', '\\]']]

    },

    options: {

      skipHtmlTags: ['script', 'noscript', 'style', 'textarea', 'pre']

    },

    startup: {

      ready: function() {

        MathJax.startup.defaultReady();

        MathJax.typesetPromise();

      }

    }

  };

</script>

<script async="" id="MathJax-script" src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js" type="text/javascript">

</script>