AutoScroll for Chrome
More About AutoScroll
It supports both sticky and non-sticky scrolling, doesn't scroll on textareas or links, and even has settings to customize various aspects such as scroll speed.
To use it, press (or hold) the middle mouse button, then move the mouse to scroll the page. Alternatively, hold Ctrl/⌘ and press the left mouse button.
It won't work on every page, but it should work on most.
● You need to refresh the site or restart Chrome before it'll work. You only need to do this once.
● Doesn't work on chrome:// URLs or the Chrome Web Store. It's restricted by Chrome for security reasons.