Mouse autoscroll

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Reason: Add some links as references. (Discuss in Talk:Mouse autoscroll)

Autoscroll is a feature activated by the middle mouse button (usually the scroll wheel) that enables fast navigation of view width. For historic reasons, most Linux applications treat a middle-click as a paste command. It might be desirable to imitate the Windows behavior, by initiating automatic scrolling when clicked on a blank area of a web page.

Chromium

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Reason: What is a "small button"?! (Discuss in Talk:Mouse autoscroll)

Install chromium-extension-autoscroll^AUR: it allows middle-click to initiate automatic scrolling.
When you program both small buttons to emit middle-click, either button can initiate automatic scrolling. That is a click function.
When you program one of the small buttons to act as scroll modifier (mouse setup), you can manually scroll web pages without fixing the browser. That is a press‑and‑hold function. (Installing the AutoScroll extension can still be installed even if it is not absolutely necessary for scrolling.)
After you assign the scroll modifier to one of the small buttons, the small buttons act a bit differently from one another. The difference is seen when you compare their "press‑and‑hold" behaviors.

Firefox

Set general.autoScroll to true in about:config.