SmoothScroll-plus by Jonthan james

Features
- Mouse wheel, middle mouse and keyboard support
- Arrow keys, PgUp/PgDown, Spacebar, Home/End
- Customizable step sizes, frames per second and more...
- Works with embedded content (flash)
- Full touchpad support
- Excluded pages list

policy:
This extension doesn't collect/transmit/store any user information (personal or non-personal). Period.

Refrence site: https://sewbroiderycraft.com/