OMG... I HATE v22 for this simple reason...
You need to give us the option to NOT autoplay embedded videos, and/or allow us to disable full screen autoplay!
If I open a page with an embedded video as a new tab in background, the last thing I want is for that video to autoplay, much less autoplay in full screen using the built in android video player, taking over the screen, with no easy way to kill it other than hitting back multiple times.
This new "feature"/behavior is driving me nuts to where I just want to throw the damned phone across the room every time it does this.