Firefox vs. This Forum

Firefox problem: I was reading a few new threads earlier today, when I found that one of the selected threads was blank. I thought that perhaps the forum had a problem, so I returned later to see, only to find that when I select the forum in Fx, the entire forum is blank.

I tried the usual Fx test by restarting it in Safe Mode, to no avail; I am using MS Edge to post this. Any thoughts as to what is happening in Fx, where no other sites have, so far today, caused any problems.

A while later: I just created a new Fx profile, and the forum works with that. I wonder what happened to my usual profile, and if I can fix it, rather than transferring requisite folders to the new profile.