Youtube doesn't support navigation using arrow keys or WASD by default. This extension enables navigational shortcuts for youtube. Using this extension you can change vidoes just by using ctrl + arrow keys or by using WASD. You cannot just use arrow keys because youtube has its own set of shortcuts to seek playback and increase/decrease volume using the arrow keys. This extension lets you use CTRL (windows) / CMD (mac) + the Arrow keys to navigate through the videos and press Enter to select and view a video. WASD shortcuts are disabled by default, but you can enable them from the settings.