I am working with the nascent 2.16 version of WeBWorK, which uses MathJax3. What is the "right" way (if one currently exists) to use MathJax extensions globally? For example, the "color" extension, or the "cancel" extension? (These are the two I would like to use.)

There is a list of extensions here: http://docs.mathjax.org/en/latest/input/tex/extensions/index.html