Trackball Scroller

Trackball Scroller lets you scroll pages with your trackball. When you activate "scroll mode", you can roll your trackball to scroll. Browse infinite-scrollable websites or long documents easily.

Flick the ball to jump quickly, or move it slowly to scroll in a smooth continuous manner; gives better scrolling experience if you're not satisfied with your trackball's scroll wheel.

No spyware, no ads, no sending user data anywhere.
Open sourced: https://github.com/jj-143/trac kball-scroller-chrome

NOTE: DOESN'T WORK on most pages on Yahoo using sandboxed iframe - Yahoo News, Finance, etc.

Works best with trackballs, feels awkward with traditional mice, no big changes with two-finger scroll on touchpads - except one finger vs two fingers.

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•  customize shortcut with a mouse button or a key (key combo activates on the largest scroll element on the screen.)
•  sensitivity

let me know if it doesn't work on any particular websites.