When you add the extension to Chrome, you’ll get a new browser button. Just go to a YouTube video and click on the button. Immediately, the video will be pinned to the page and you can scroll down to read through comments as the video plays. Unfortunately, clicking on the button again does not unpin the video; you’ll need to refresh the page or go to a new page in order to unpin it.
As you can see, this is a great little extension that is sure to come in handy for those who love reading comments while watching videos on YouTube. Note: This extension only works for videos on the YouTube.com website. Video Pinner