Surprisingly delighted with this extension. My settings for a built-in trackpad in Mid 2012 MackbookPro 15 on Ubuntu 19.10 are:
- Step size: 50
- Smoothness (Forepart): 3.04
- Smoothness: 87.42
- Acceleration Sensitivity: 124
- Acceleration by travel distance: 1.39
It removes the awkwardness on my fingers at the fresh installation. I will still have to adjust a little bit though.

tested 3 scroll-addons. this is the best.
- Very clear and intuitive settings menu.
- All settings have high usage potential.
- The effects of the settings are accurate and absolutely functional.
- Changes can be tested without updating the page.

Poor performance with smoothing while on Linux.

Unlike the Chrome version, this one makes scrolling much worse. It should work out of the box.

When you scroll to the very top. page bounces back. Please add an option to disable this move

Excellent little extension. A go-to for any of my fresh Firefox installations.

Musthave addon on GNU/Linux

The best, It works on Linux and replace Libinput lack feature.

Excellent! Advanced options to customize the mouse wheel sensibility, acceleration, smoothness, speed and even more settings with wide range values. Transformed my mouse wheel behavior in Linux with Gnome from very slow to very fast sensitive! Congratulations to all developers and collaborators! Jorge, from Brasilia, Brazil.

Outstanding addon! It relieves so much aggravation for me. THANK YOU kataho!

It does not work smoothly, you can not turn off the add-on.