Can Mathjax be used with https?
This script renders latex if the page is called http:..., but not https:...
<script type='text/javascript' src='http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML&ver=3.5.1'>
</script>
Yes, see http://docs.mathjax.org/en/latest/start.html#mathjax-cdn. Use the script
<script type="text/javascript"
src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
</script>