Tube Audio Options+
Audio only mode for youtube.com and m.youtube.com
Stats
Other platforms
Summary
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.
Safety
Risk impact
Tube Audio Options+ is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install Tube Audio Options+ if you trust the publisher.
Risk likelihood
Tube Audio Options+ is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.