For example, when a YouTube video is playing in the background, and you try to close Firefox, it could give a popup saying "Audio is currently playing in a tab. Are you sure you want to close?" And it would give you a yes or no.
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yes be with the option to disable that allert
Why are you shutting down Firefox, just hit the home key, leave it runnin. And the music will continue to play.
Because some people close their browsers when done with a task? This isn't ChromeOS.