It's most likely a WebGL error: see if these instructions help if this is the case (https://www.interplaylearning.com/help/how-to-enable-webgl-in-firefox https:

It's most likely a WebGL error: see if these instructions help if this is the case (https://www.interplaylearning.com/help/how-to-enable-webgl-in-firefox https://www.interplaylearning.com/help/how-to-enable-webgl-i...)