I'm too seeing raw $ markup. Nothing's blocked, no console errors, but there's a "425 No Reason Phrase" response for https://cdnjs.cloudflare.com/ajax/libs/mat

I'm too seeing raw $ markup. Nothing's blocked, no console errors, but there's a "425 No Reason Phrase" response for https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js?config=TeX-MML-AM_CHTML https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax..., not sure if it's relevant. That's in recent Firefox. More specifically, when I open the page by clicking on the HN link or copy-pasting the URL into the bar and pressing Enter, the page renders OK. If I am to reload the page with Ctrl-R after that, it shows up in raw $ markup and no amount of refreshing helps. Furthermore, full reload (via Ctrl-Refresh) yields that 425 response. Just FYI.