My linux PC is pretty old, and it took a while, but this extension was able to convert and save a 35 minute instructional YouTube video to a small mp4 format. It worked well, but I had to scroll down to below the video to see the progress this extension was making in conversion and saving.
There is one bug - if I click on another YouTube video in the same window, and try to convert and save that video, it doesn't -- instead it downloads, converts and saves the original video I viewed in that window, making another copy of it.
It seems like I have to close FireFox before trying to download another video.

I also have the Video Download Helper extension with the local helper app installed. This add-on succeeded on youtube when that one failed. I will likely keep it and just have it disabled until I need it, but it seems to work.

EDIT: Disabling it makes it clutter up the youtube page even more. The button spot turns into a bunch of html links to the videos. 4 Stars for it working when others failed, -1 star for it not fully disabling. I ended up removing it as it seems to be sketchy at this point.

Great extension!!

Just so glad that this is back and it works great!

great tool

The downloads do not show you what language you will receive. I prefer English, but I keep getting German, Chinese, French. This is very frustrating.

I actually paid for this extension a while back because I loved it so much. It went through a phase where it didn't work with youtube videos, but respect to the author of the plugin, he made it work through the horrid new youtube changes. A recommended plugin, highly recommended, and worth making a one time payment for to support the author.

Works awesomely!

Пока нормально, посмотрим как дальше будет работать!

NOTHING WORKS!!!!!! I have tried using this thing about a dozen times now and it just doesn't work. Ive tried 2 different videos now and the same thing. It says it has downloaded but when i go to play it back nothing but lines and discolored picture. What am I doing wrong? this is crap

Can sometimes be clunky but i can't see how i'd manage my day to day life without this wonderful companion. I can't hve enough of this recently updated youtube downloader. :O

Good