Sorry about that. I can confirm that it does work on Chrome, Firefox and Edge, so if you have access to one of those browsers you could give it a try.
What version of Safari are you using? WebGL 2.0 is required and Safari added WebGL 2.0 in Safari 15. If you are using an older version of Safari, I suspect that might be the issue, but I don’t have a Mac for testing, so I am not sure.