Take control of YouTube playback with the Transpose/pitch/speed/loop Chrome extension

Source: Transpose ▲▼ pitch ▹ speed ▹ loop for videos – Chrome Web Store

Transpose ▲▼ pitch ▹ speed ▹ loop for videos is a cool extension if you use a lot of YouTube videos for learning. YouTube has speed controls, but this extension adds more control on to the videos.