I've tried this off & on for over a year & have NOT ONCE managed to download anything. All I ever get is "No media found".
Others apparently have but I see no reason why it shouldn't work for me specifically. (Firefox/WaterFox)

Doesn't work for YouTube, thanks for wasting my time

Excellent

BEST video & audio downloader YouTube downloader extension I've tried! Intuitive simple & easy to use works every time, works on Firefox for Android.
To the developer, Thank You for sharing this extension! ★★★★★

didn't work on YT. "error"

Unexpectedly brilliant!

The only video downloader that actually works

Amazing

Surprisingly good... better than expected.