Hmm, this doesn't work in Chrome on your https page, because you load JavaScript (MathJax) with http and Chrome refuses to do that...
Thanks for the report. Will be working on it!
//cdnjs.cloudflare.com/ajax/libs/jquery-tools/1.2.7/jquery.tools.min.js
Here's a texpaste showing what you should change your script src's to. https://texpaste.herokuapp.com/n/lyoitffa