NO sirve.
Para usarlo hay que suscribirse al servicio "PRO" que cuesta caro.

This is an outstanding FF AddOn!
If you always wanted to access HD quality video on YouTube offline this is for you. Simply the best I've found, and the creator, Dishita provides timely updates too!
It's a steal at a $10 donation, but I like to watch offline in HD so I bought the Pro version.

ok

Almost perfect, but does not support 1080p and beyond. Otherwise, it works as described, very very fast download.

Fine but also does not support uhd and 4k

Thanks for your kind service!

Cannot even check if it works without paying. Should be very explicitly marked as a paid extension

Was briefly useful, before gating the ability to download mp3s behind a paywall.Now it is no longer so.

easy to use

Have used this for years with great success!

Requires me to pay to download mp3... (even 128kbps)

One of the simplest, straight forward downloader. Been using this extension for years. The PAID upgrade is highly recommended, rewarding you with unlimited high quality downloads. AAAAA+++++

Years went by... This author never fails in up-keeping its countless updates and still the BEST!! :)

Worth every cent of the very reasonable price paid for this gem of an extension. Excellent support as well.