Currently the Math preview type (added in T208758) is unconditionally registered and the user has no way to disable it in the same way they disable page previews despite there being a settings config visible.
Example page:
https://en.wikipedia.beta.wmflabs.org/wiki/Mass%E2%80%93energy_equivalence
This will require a change in the Popups extension.
When that change is done it should be as straightforward as adding a preference and some messages (example https://github.com/jdlrobson/mediawiki-skins-skinjson/pull/18)





