All these years using Firefox, I did not know this feature existed. On the other hand, a few years ago I accidentally triggered PiP in mobile Safari, and it wo

All these years using Firefox, I did not know this feature existed. On the other hand, a few years ago I accidentally triggered PiP in mobile Safari, and it worked so inconsistently especially on YouTube when switching to another app, that I dread using it. (Recently invidious showed how to do it properly)