See blank popup window, where (presumably) graph should be shown
Check dev tools console to see the following error:
In firefox:
Blocked loading mixed active content “http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML”
In chrome:
Mixed Content: The page at 'https://kb.knomaton.org/multi-agent-systems/' was loaded over HTTPS, but requested an insecure script 'http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML'. This request has been blocked; the content must be served over HTTPS.
Steps