Once upon a time, Chrome didn’t know how to scroll things smoothly, so (some) developers thought that’s a great idea to alter the browser behavior. So they added a small script, called… smoothscroll.js (I know, very original!)
Aaaanyhow, time passed by, Chrome added support for smooth scrolling by default, scripts weren’t removed and… behold,
all most of the sites that are using this beautiful piece of code.
hipsters real developers are using Mac OS, and no one is even aware that there is a problem somewhere.
So please, do yourself a favor and remove that damn script.