this expansion is great. It would be godlike if the play control was carried out not on the active tab, but on all together. maybe this extinction will help to do it: https://addons.mozilla.org/firefox/addon/sound-control/
https://addons.mozilla.org/ru/firefox/addon/media-controller/?utm_source=addons.mozilla.org&utm_medium=referral&utm_content=search
https://addons.mozilla.org/ru/firefox/addon/sloth_music_controller/?utm_source=addons.mozilla.org&utm_medium=referral&utm_content=search