It works good but its addon tab pop-up every ~10 minutes and show hint "extended app not installed" or smth. Can you fix it please?
upd
It eat a video name under the video: https://screenshots.firefox.com/NnAbbHalr4EbIHZY/www.youtube.com
(there is not because of other addons).

Linux user here. This add-on saves my CPU life! I can see web videos on MPV, SMPlayer, etc, etc, etc. Very customizable!