Thank you very much for your feedback! If you encounter any bugs, please report them on GitHub and we’ll be happy to take a look.

You may also be interested in this add-on, which pairs well with the one you installed - both developed by our team: https://addons.mozilla.org/en-US/firefox/addon/youtube-uninterrupted/

Both add-ons are 100% free and open source, and they’re designed to complement each other. One keeps YouTube playing in the background on Android, while the other prevents the background video from being interrupted by YouTube’s “Continue watching?” prompt.