Set 0 interval is good tip for continuous scrolling. but too fast for 0.1 window size (minimum). Please enable 2 decimal input for window size (minimum to be 0.01) or allow interval input in milliseconds.
And it will be good if I can toggle start/stop by touch on screen (I use Android)

On Firefox android does not continuously scroll. When you press scroll, it does it once then never again. A shame because there it seems this would be the only auto scroller that has the simple features I want.
Edit: I am using the most up to date version of Firefox available from Google Play, 133.0.3 is listed in the Firefox settings. I set the interval for 10 seconds with a scroll amount of 0.8. I was wanting to read and thought that would be the ideal setting. Is it that I should have set a smaller scroll amount and put the interval as 0?

it's good and i like how it scroll, but it will be better when we (as a user) can custom delay to scroll. keep it up!!!