Mein Lieblings-YouTube-Downloader!

In general, it works, thank you. But it would be cool to be able to download videos without going to the page, while remaining on the main page.

an excellent youtube downloader. strongly recommended

I've been using this add-on for a long time..and , to me.. it is the only reliable YouTube video downloader out there..
Kudos on the developers as ..dealing with YouTube's policies and code is not a wall in the park.
Cheers from Portugal !

It works pretty well. Unfortunately, HD (720p) and more require server processing on the part of the addon's developpers (Youtube having split up sound and video), hence a paid license.
NOTE TO THE AUTHOR(s): a feature allowing to download both files anyways would be nice (without the requirement of server processing on your side): I have tools for merging and converting those files myself locally via an Open Source program.

Works well as a low-def in-browser addon, but no addon app for my (ARM Linux) based platform for hi-def videos.