Weird, same as me.
Could you press F12 to open developer tools, then go to the "console" tab and reload the page to see if it shows something weird?
I forgot to say, that it worked after I written the comment 13 hours ago… I think, i fixed it, do to what happened to other sites… I opened “Help”, then clicked on “felecture correction”, then I got in a other mode, and as I opened Firefox normally, all sites worked correctly again, and also your browser game (HTML5) ;)
This little bug fix I used to get streaming sites working again. The help I taked from gemini ;)