If you prefer seeing only your YouTube video on your screen with nothing else, then this is a great tool. This extension can remove other HTML elements from your screen apart from the video itself so you can focus solely on what you're watching.

There's also a feature that allows you to choose a custom background color while watching the video. However, you can also choose to allow the extension to use the predominant color from the video so it will change dynamically. 

You can find it on the Chrome Web Store.

How to use this extension:

The first thing you need to do is enter your login credentials on the first page of the app.

The next step is to enter the URL of the YouTube page that you want to browse.

Finally, you will need to click the start button to get the video.

When you find the video that you want, you can stop it by hitting the Stop button.