Thanks - that's something I haven't hit yet. That error is the engine failing to create its main render target: it asks for an RGB10_A2 color buffer, and your browser's WebGL2 is refusing it. It's below my code, so I can't patch it directly, but I'd like to pin down which configs it hits.
If you don't mind,could you open about:support in Firefox, scroll to Graphics, and paste that block? The GPU/driver lines and whether it says WebGL2 is hardware or software is what I need. And if you get a moment(sorry for asking too much) does it start on a chromium-based browser on the same machine?
Sorry it dumped a wall of stack at you instead of saying something useful. Fixing that part is on me.
