As of today, if I try to edit any of my answers or questions on the main site in Firefox, MathJax renders very slowly and incorrectly in the edit preview.

Some lines (which look fine before I click "edit") won't render at all in the preview, and the lines that do render in the preview don't have proper spacing or alignment. And nothing renders at all until I type something.

I'm encountering similar issues when trying to compose a new answer.

The edit preview works correctly in Chrome.

I'm using Firefox on a Windows machine.


The edit preview was working correctly in Firefox earlier today (12/29), but now it's broken again.

Second Update:

This is only an issue with the main site. The edit preview on Mathematics Meta always renders MathJax correctly in Firefox.

  • $\begingroup$ Have you tried clearing your cache in the browser? $\endgroup$
    – hardmath
    Dec 26, 2023 at 5:30
  • $\begingroup$ @hardmath Yes. I also disabled all extensions and turned off tracking protection in Firefox. $\endgroup$ Dec 26, 2023 at 5:37
  • $\begingroup$ I tried opening an edit on a short post with MathJax in Firefox, but did not observe any difficulty in rendering. Perhaps you could link to a post which gives you slow preview, etc.? $\endgroup$
    – hardmath
    Dec 27, 2023 at 15:59
  • $\begingroup$ @hardmath It's not any posts in particular; it's every post, including other people's posts. It must be an issue on my end. $\endgroup$ Dec 28, 2023 at 4:46
  • 2
    $\begingroup$ "Me too!" I've experienced the issue intermittently over the past month or so. It's intermittent in the sense that it changes day-to-day, though generally not post-to-post. On days it's not working, it fails everywhere. This was observed on two separate Linux machines, so it seems unlikely to be a one-off "cache corruption" issue. Anyway, clearing the cache didn't help. Currently, I'm seeing it on Firefox 121.0.1; not sure what version was installed when I first noticed it. $\endgroup$
    – K. A. Buhr
    Jan 19 at 21:48
  • 1
    $\begingroup$ @K.A.Buhr If I'm just browsing the site, Firefox renders MathJax correctly and much, much faster than Chrome. In the past, MathJax issues were always fixed promptly, even minor issues. But now a MathJax issue will only get fixed if it's an issue that completely breaks MathJax rendering everywhere and on every platform. $\endgroup$ Feb 22 at 21:52


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