`Unable to start: can't access property "getSupportedExtensions", this.gl is null`
Doesn't work on Firefox Mobile.
You might have webgl disabled. In the URL bar:
about:config -> webgl.disabled: false
Works over here on Firefox Mobile 159.0.1
Works in Fennec (F-droid), doesn't work in Brave
Works on Firefox on iOS.
Safari/Chrome on iPhone fail.
Works on iceraven on mobile for me.
You might have webgl disabled. In the URL bar:
about:config -> webgl.disabled: false