Once you install the add-on, you'll see a small icon next to the address bar.
In case you are watching a video on Youtube and the lyrics are available, that button will get red. Then, just click it and you'll view the lyrics there.
YouTube Music Video Lyrics is a really useful extension. Perfect for music fans who want to know exactly what those songs say. The message is important, so, read the song to fully understand it.
You'll have the lyrics just one click away thanks to YouTube Music Video Lyrics.