The silliest one is my Plex web admin page. I even had to make a Github issue request about it, and found a bunch of others who had done the same thing.

Several government websites, among others. I should start a list. I’m sure it’s a combo of unlock origin with FF’s privacy protection settings, but I’ve tweaked it so much for the websites that are broken and nothing ever changed. Switched over to Safari and everything loads beautifully.