Mouse scrollwheel scrolls many lines- but only Firefox

What I have: Latest Firefox browser with Windows 10 on a Dell laptop, and a Bluetooth mouse with a scroll wheel. In Windows Settings, the scroll value is set to 3 . ( Choose how many lines to scroll each time ) What I see: Moving the scroll wheel works as expected everywhere except in Firefox. In Firefox, all content (web page, text areas, sidebars, etc.) scrolls more than 60% of the entire screen height. This makes scrolling with the mouse almost entirely useless. Sometimes Firefox suddenly works as expected, and I see no pattern in when that happens. For instance, I was working in another ta

Question by Torben Gundtofte-Bruun on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.