normalizeWheel too fast in Windows firefox

[danieljames-dj]

Hi Developers, first of all, thanks a lot for the normalizeWheel function, it is really helpful to tackle the mess-up of the way how web is handling scrolls. I would like to point out that in Firefox (somewhat latest version) of Windows 10, the scroll is too fast when scrolled using mouse. The event generated using normalizeWheel is giving a pixelY of 600 for firefox, which is way too much. But for Chrome, it's giving just 100 - which looks very normal.