Hmmm, now and then I stumble over links that just won't work on Firefox, even with uBlock and uMatrix disabled. Here's one, I click "Start quick game", and all I get is black. Is this normal or an exception?
are you using some kind of firewall? Some users are facing problems when using them
Really not anything beyond the mentioned plugins. On my old system, I could open the offending pages in Chromium and they'd usually work there. On my new one I have no second browser yet, because my distro is Ubuntu-based and I've purged the snap bs.