set these in about:config
setting | value |
---|---|
general.smoothScroll | true |
general.smoothScroll.msdPhysics.enabled | false |
general.smoothScroll.mouseWheel | true |
general.smoothScroll.mouseWheel.durationMaxMS | 400 |
general.smoothScroll.mouseWheel.durationMinMS | 400 |
general.smoothScroll.pages.durationMaxMS | 500 |