Enable mouse wheel autoscroll feature in Chrome Is it possible to enable autoscroll (scrolling on mouse wheel press) in mac os? In windows it works out of the box, in mac id does not. Macos 10.6.8, Chrome v21
There's an extension called AutoScroll that enables scrolling while pressing a middle button.

You can also enable it everywhere in OS X with Smart Scroll. See this question.

To make middle clicking work with a Magic Mouse, you'd also need to install an application like BetterTouchTool or MagicPrefs.