My browser / operating system: macOS Big Sur, Firefox 95.0, No Flash versions detected
This is what happens when I try to load a project:


By the way, I'm on safe boot. WebGL is on.

Your snapshot of a project page is different from mine. If you have some kind of extension (and Please don't use any names) I'd suggest removing it and trying it again.

Also, do you get any other errors and could you post a link to the project that you are trying to run?

Never mind, I fixed it.