The preview box to the right when creating a post is no longer working for me on Firefox 52.3.0 (Mac OS X 10.12.6).
If I use the inspector I find these errors:
Blocked loading mixed active content “http://root-forum.cern.ch/assets/markdown-it-bundle-91aeb6600f2162d2794f12418867fef862f49ea60a788ebe93b131e36535bd08.js” [Learn More]
[Learn More]) is a link to here.
I’ve seen some people complaining about it on discourse website, but the solution see to be on the administrators end: