Hello, I am using Firefox on Ubuntu with an AZERTY keyboard. I couldn't move with (unnatural) WASD, nor (more natural) ZQSD, nor (most natural) arrow keys. I could look around using the mouse. A couple of empty white rectangles were in front of me. Suddenly became four empty white squares (like keys ?) when I clicked them. No idea what they are for. All this still need some UI polishing, I would say.