The firefox "Auto Tab Discard" I have is pretty aggressive in that it has a user selected list of conditions that allow an inactive tab to avoid being discarded

The firefox "Auto Tab Discard" I have is pretty aggressive in that it has a user selected list of conditions that allow an inactive tab to avoid being discarded (media playing/etc). So if the user hasn't explicitly allowed media playback to keep the tab from being discarded, if its in a background tab it gets discarded too. Hence why I put a media player I want to run in the background in its own tab and whitelist it.