Typ in de adresbalk about:config en druk 2x enter.
general.smoothScroll.currentVelocityWeighting : 0
general.smoothScroll.mouseWheel.durationMaxMS : 250
general.smoothScroll.stopDecelerationWeighting : 1
mousewheel.min_line_scroll_amount : 20
Sleepyhead and Oscar both keep crashing if your graphicscard GPU workload setting is on "compute" i.s.o. "graphics".