Open source: https://github.com/schdie/we_firefox_ytop_mv3 On desktop it adds a toggle in the lower right corner of the video player to enable audio-only playback, allowing you to save battery by disabling the video rendering and bandwidth by downloading only the audio stream. On mobile it adds a semi-transparent floating button on the lower left part of the screen to enable audio-only playback, you can also "leave" the page and playback should continue normally. Seamlessly switch between audio-only and video playback using the toggle on desktop or button on mobile. Works best alongside an adblocker like ublock Origin. Limitations: Doesn't work with live content. On desktop using the YT miniplayer may have unexpected results. Depending on your network connection on some rare cases it may take a couple of seconds to get the audio-only stream, until it does (and also depending if you have autoplay enabled or not) it may render the video first but just for a couple of seconds. Permissions: "Access your data for sites in the *://youtube.com domain" is required to change the video/audio source of the player. "Access your data for sites in the *://googlevideo.com domain" is required to capture the audio-only stream.

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