This amazing Chrome extension by Kevin Dang lets you watch your favorite YouTube content while you're surfing on an entirely different website.

With the help of this browser add-on, you can continue doing your research while still being able to see a YouTube video. Once you leave the streaming website to open another tab, the video will automatically hover over the window you are currently visiting. This way, you no longer have to split your screen just so you don't miss out on what you're watching.

Additionally, you can control how much you want to expand or contract the size of the video.