You may be using an outdated browser version that doesn’t support some features. Please update your browser to the latest version for the website to work properly.

I also get the glyph message on my Firefox 144.0b8 and it runs fast here, so I guess that shouldn't be the reason...

RTCPeerConnection is available in Firefox and Chrome since 2017... son unless the browser is veeery old... Maybe something blocking RTC?

Yes, the issue may be caused by WebRTC being disabled in your browser settings.

The right thing to do it to handle that gracefully on the website and inform the user.

You are right. I am gradually trying to describe all potential user issues more clearly, but unfortunately, it is still not done comprehensively.