YouTube Video Controller for Shadowing is a Chrome extension developed by Hiroms. This free extension is designed to assist users in practicing shadowing on YouTube by providing convenient keyboard shortcuts.

With this extension, users can save and move to specific playback positions by pressing the 'x' key to save the current position and the 'z' key to move to the saved position. Additionally, users can easily go back 2 seconds from the current position by pressing the 'Z' key.

The extension also offers control over playback speed. Users can decrease the playback speed by 0.1 by pressing the 'a' key, increase it by 0.1 by pressing the 's' key, and reset it to 1.0 by pressing the 'd' key.