I'm considering moving from Safari, which waits till they're the window on top. This could seriously complicate eg. browsing a list of suggestions, where habit has been to open the ones i like the look of in tabs to maybe watch later, sometimes much later... Chances are there's a fix somewhere, and i guess it might be a Youtube thing not a Firefox thing. I want a page to sit there, not launch video or audio until i specifically turn to it (in fact better still not automatically launch even then). Any advice?