PiPfier
While most apps and sites let you watch their content in Picture-in-Picture mode (PiP), there are other websites that block it.
A great example is YouTube. Some people in the world can’t use PiP on YouTube unless they subscribe to YouTube Premium.
Fortunately, if you don’t want to pay extra, you can use an extension like PiPfier. PiPfier lets you watch any video in Picture-in-Picture with just a few taps.
And the best part is that it also works with YouTube, at least at the time of this writing.
Granted, you’ll need to access YouTube on the web instead of using the app, but it’s a small price to pay for multitasking.