This extension allows you to scroll your webpage without moving your palm.
By default the Chrome browser only allows you to scroll the page by the arrow key, or page up/down key. Those keys are usually located at the edge of the keyboard. As a result you will have to move your hand around when you scroll.
This extension allows scrolling with the H, J, K, L keys, just as in vim, or with the A, W, S, D keys just like you do in a desktop game.