Don't wast your time with this add-on, go for "Easy Youtube Video Downloader Express" instead because it works !

Way too slow.

Cannot detect URL of new videos any more.
Fails to combine video and audio files. Does save video and audio files separately. Asks to install a native client and FFMPEG applications, but even after those are both succesfully installed and the browser is supported, fails to combine the video and audio files.
The video tutorial for installation is horribly poorly done, and doesn't even show the extension's option page.

I can not get this once great extension to work at all.

Doesn't let you download videos with sound or audio in a MP3 format.

The 0.8.3 version only shows videos with 360p max!!!

info.title is undefined ??? WHY? HELP ....

doesn't work recently

why no audio and video in one? Hell's Kitchen vids

not work. "extractFormats: No link is found"

Don't work now(((

Did nothing.

50kb\s speed download youtube m4a audio 128k

cant work

download panel doesnt work, quick download downloads a lot of files, crap app

The native client trips my virus scanner.

It is also not explained what exactly it does, nor where it installs itself to. Really any details are missing to make any kind of judgement on whether it is safe to use.

Add to that, the number of spelling mistakes in this extension make it feel shoddy. I'm going to leave this at one star because of the above. If not fixed within a reasonable amount of time, I might decide to report this addon for auditing.