Short version: show the scroll bar while scrolling, hide it while static. Long rant: why did you remove the scroll bar? I know physical scrolling is trendy and all, but that's no reason to get rid of the functionality provided by the scrollbar. There are two really important functions that are not available with inertial dragging: - "random access", i.e. arbitrary absolute positioning at any point (useful on long pages, where scrolling takes a lot of time and user effort). - showing how long the document is, and how much of it remains unseen. This is a killer feature that permits sense making of navigation in digital documents - removing it is insane. I know you're worried about screen real state in mobile Firefox, so I suggest a solution that recovers the missing functions while not wasting real state: - Show a (traslucent?) scroll bar while the page is being scrolled with inertial scrolling. It shows the scrollbar when it's most needed (while scrolling), and hides it when it's not (reading). If the scrollbar is pressed or interacted with, then it should remain visible even when static, available to further interaction, and it would hide when clicking outside of it.