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Doesn't seem to work on Firefox mobile. On each stroke it only renders one "point".

Hm. What OS do you use? It works fine (for me) in Firefox on iOS. Haven't tested on Android.

For me, Firefox on Android, I get this:

One stroke draws one spot at the starting point. Any number of further strokes draw nothing. When I tap outside the canvas I can draw one more point

Could you please try it now? Pushed a fix, but have no Android to test it.

Still only one point