On iPad I can scroll freely. On desktop with Firefox and Chrome I can't:I can only go to specific "screen", not in-between them. Wheel moves with slow transition to the next screen. I can scroll the wheel super fast and it only does one scroll event at a time, so if I wanted to go quickly from top to bottom with wheel I can't do that. I have to wait for the transition. I can't middle click (wheel click) to get into free scrolling mode. There is no scrollbar, only small buttons that I'm supposed to click.
Also, iPad seems broken when I go from vertical to horizontal: suddenly I can only scroll from first screen to the fourth one, and back again.