"Picture-in-Picture lets you watch videos while “working”
This was perfectly timed. I've had the C-Span stream of the impeachment trial popped out and on my second screen, and it's been great. I do wish it had more fully-feature controls, though---a 10- and 30-second skip-back would be welcome for when you pick up on something that you want to see.
Picture-in-Picture lets you watch videos while 'working' | The Mozilla Blog
Some days there’s something extra interesting to watch online — a sports event, election coverage, a certain show is leaving Netflix so you gotta binge