Auto PIP when tab is changed

[bufu]

Give us an auto-PIP option that enables PIP automatically when I change from a tab that is showing a video to another tab. When going back to the original tab and that video source is shown, disable it again.

When multiple video sources are available, make it so that the last viewed tab with a source is shown in the auto-PIP. It should also be possible to have multiple PIP instances open (like it is now) but the ones that are enabled manually should also be disabled manually.

[asafko]

Hi folks!
Unfortunately, PiP work we're not staffed to work on PiP improvements actively this year.

However, we've got some good news — the engineering team is in the process of reviewing a contributor patch for auto-PiP, and hopefully, collaboratively, we'll get it to the point where it can ship. We'll keep you posted on the progress!

[Skjiisa]

This is something I love from Arc that bugs me when I come back to Firefox