"Developers can opt to exclude the Picture-in-Picture button from videos hosted on their domains and inform users that the Picture-in-Picture experience might n

"Developers can opt to exclude the Picture-in-Picture button from videos hosted on their domains and inform users that the Picture-in-Picture experience might not be the best fit for their website. In such cases, Firefox will display a notification indicating that Picture-in-Picture is not recommended for that particular website. However, you retain full control and can override this recommendation by activating the Enable anyway option. This empowers you to choose to use Picture-in-Picture, even if the developer discourages it." This is at the bottom of the Mozilla KB article about PiP, and I'm just assuming that this was added after this bug was created. Unless a brief pop up telling people they are allowed to turn it back on is THAT horrible, I don't get why this wouldn't work for you.