In the address bar of Firefox type about:config and press enter.
Accept the risk involved while making changes.
Search for mousewheel.
Look for mousewheel.acceleration.start and to enable it, change its value to 0 by double-clicking on it.
Comparing to Google Chrome, Firefox has very slow scrolling speed for web pages. It is smoother than Chrome but not just fast enough. And I end up scrolling by dragging up the scroll bar which is a little annoying. You have to drag the mouse or finger to grab that scrolling stick. And drag again to scrolling happen.
You know that our universe, which contains our earth, sun, other stars, planets surrounding these stars, our Milky Way galaxy, other galaxies, everything you name it; is expanding. Thanks to Georges Lemaître and Edwin Hubble who figured out about the expansion.
What does it mean? It means, our earth along with its residents, actually floating and moving, within its own galaxy, through the very basic fabric of the universe. Can you imagine? We are not staying still in one position. WE ARE MOVING! Literally through space and time. If you look at the whole picture, everything is moving. And that is how the universe works.