Scroll with Middle Click [duplicate]

It is native in firefox (hurray) , well at least 41.0

goto Preferences/Advanced/General/Browsing/"Use autoscrolling"

or maybe Settings/General/Browsing/"Use autoscrolling"

The AutoScroll extension for Chrome (Chromium) achieves this. After a single click of the middle mouse button the cursor changes, and moving the mouse in a direction will cause the window to scroll in that direction even without continuing to press the middle button. Scrolling stops when a mouse button is pressed (left, centre, or right).

If you are using Chrome or Chromium, you can install this chrome app that will enable you scrolling with only the middle button of the mouse, however you have to continue holding the middle button down while scrolling

Not really. There are some things I have see to make this kind of work, but I have never seen a true working config.

This article looks at adding the ability to scroll using the TrackPoint in a laptop, by adding a config file into the xorg.conf.d/ folder.

The theory should be the same, but I have never personally seen this work the way you want it to.