YouTube: Play Only Audio is a Chrome extension developed by Dhaval Mehta. This free add-on falls under the Browsers category and specifically the Add-ons & Tools subcategory. The purpose of this extension is to allow users to turn off the video of any YouTube video and play only its audio.

One of the main features of YouTube: Play Only Audio is the addition of a "VIDEO: ON/OFF" toggle button to the YouTube video player. This button provides a quick and easy way to disable video playback and enjoy the audio content. The extension works on individual tabs, so you can choose to disable video in one window or tab while keeping it enabled in another.

It is important to note that the functioning of this extension may be affected by ad-blocking software. Additionally, it may not be compatible with live videos. Overall, YouTube: Play Only Audio is a useful tool for those who prefer to listen to YouTube content without the distraction of video.