You can download the video and also convert it to audio only.

Older version worked for me, but 1.0.8 does not work for me. So I rolled back to 1.0.2.

I was trying to dowload rhymes and some baby songs from youtube and this is by far the most simple and effective extension an di have tried most of the other ones but nothing beats this one. well done devs you made my life easy

simple n praktis bangeet..

The best of its class, in my experience.