I can see a thread on an issue with using Firefox to access the site, but I have a different issue.
I'm using the desktop site and Firefox v76.0 on Windows 10 - pages are displaying, but not correctly. All the menu bars at the top are not showing correctly, and the logos are massive, so that the actual content is pushed right down the page. Been happening for a week or so now.
Attached is a pic of the very top of my screen.