Firefox mobile actually has an add-on specifically to play youtube and other videos with the screen off. https://addons.mozilla.org/en-US/firefox/addon/video-b

Firefox mobile actually has an add-on specifically to play youtube and other videos with the screen off. https://addons.mozilla.org/en-US/firefox/addon/video-background-play-fix/ https://addons.mozilla.org/en-US/firefox/addon/video-backgro...