I've been using this addon for a very long time. It does what it says, lets you download videos. For 720 and 1080 downloads, you do need to donate, but it's a one-time payment with a price of your choice.

Obligé de payer pour l'utiliser normalement.

Hi I have donated but still can't download very slow, please advice thank you

At last I found the perfect add-on! VERY well worth the Pro upgrade. As someone else said, I am getting so much for so little money.
Thank you Dishita. I wish you the best!
K.A.

Fantastic Product... Definitely the best video downloader around... I have used the free version and the Pro version, the ease at which you can download the videos are amazing, and the quality is perfect no matter what resolution you choose... I would definitely recommennd this to everyone...

Really neat solution! Recommended by Firefox so no worries about safety.
5$ is money well spent for full version and I could use Paypal instead of creditcard to pay as well.

Easy to use, Thank You

People have written a whole bunch of things that aren't true. The first thing I did was download a 45min youtube video at 720p. It took under 2 minutes and was totally free. Very simple and intuitive interface. I then chose to donate because the darned thing works so well. People say that payment is required in order to download in HD. Okay, but the amount of headaches that this add-on is saving me is so huge that I don't care. (I like to watch videos while I wash dishes, but my wifi doesn't 'reach' into my kitchen so videos stall when live streaming. And 1000 other reasons that I like to 'preload' youtube videos for offline viewing)