[nine_k]

Cannot confirm any of these points (Win 10 pro, Thinkpad T490p). Everything is buttery smooth, and does exactly what I would expect it to do, both zooming and scrolling. (I only tied the touch screen, though.)

Maybe check your touchpad and touchscreen drivers.

[mdoms]

It works perfectly in literally every piece of software I use other than Firefox (which I don't use, for this reason).