How can I save the video broadcast of the conference in video (with sound)?

Question

linux

Good day.
Interested in the following question. There is a webinar. It can be on any of the platforms (if it matters): youtube, joinme or somewhere else. But from my side (from the listener side) - it is broadcast in the browser (chrome or firefox). I’ll immediately complicate the task - the tab in which the video is playing is not always the active window. It can not only lose focus, but also fold. At the output, I would like to receive a video from this webinar. With sound.
Is it possible? If yes, what can help me?

Answer 1

I ran on the second monitor)