Hi,
I just looket at your site with FF Quantum, but I don’t see any errors on the console, see screenshot: https://i.imgur.com/2cp1tKm.jpg
There are a few messages in the console, but those are not coming from the asp console log. You might have to clear your cache, I’m not sure. Does this appear on a specific page?
Let me know if the errors still appear later, and if you copy a few of them or maybe a screenshot may help, as I can’t see them.