I highly suspect this add on of loading malware address which the antivirus catches. Many of the add ons on firefox are dangerous for security; the vpn misuses our facebook and so on.

You're forced to download a lot of crap to make it work correctly, others do the same job better without having to install anything

STILL cannot do video PLUS sound..
will not do ytube 'raw' eg spherical for 360

Do not work: "Batch downloading is interrupted."

Stopped working for me. Again. No more button. Very slow download of all streams and stops unexpectedly.

Extremely complicated installation. I followed the first step in the "About this extension" section, install "native client" (whatever that is) - nothing. I don't really need or want HD - my connection has a data limit - but I decided to try installing the ffmpeg thing too. It hasn't helped. The icon below the video produces a big orange box with only an hourglass in it. "Quick download" (upper right corner of the browser screen) produces a "Please Wait" message but the browser shows no download in progress and if there is one, I have no idea where it's been saved (I looked in all the usual places). The Settings page includes something about an "ffmpeg path" with a box that's empty; maybe it's supposed to have something in it but I don't know what. I don't understand most of what's on that Settings page anyway. This extension may be fine for people with a lot of knowledge of how addons work but that doesn't include me and I'm stumped. From my point of view, basically - it doesn't download anything and I don't know what to do to make it start. I'm removing it.

Update August 2024: unfortunately the addon no longer works because YouTube has announced a war on ad blockers.

Old review: Version 1.1.8 sadly doesn't work - shows an hourglass indefinitely. Waiting for a fix.

Would be great if you added support for music.youtube.com

Did not work. Video metadata error. Searched for Kaner extension, which worked.

It is useless, you have three options:
1)download 320p video AND audio;
2)download video BUT NO SOUND
3)download audio but with ads AND JUST SOMETIMES!

Stupid.

Ya no sirve

unable to receive video metadata
even old version and current version

Doesnt Work. But I found one that Does :) Kaner YouTube Downloader >> Look for it GUYS it freaking WORKS :) . And I never write reviews but after one hour Searching I found the only One that REALLY DOWNLOADS!!

How is this still "recommended" by Firefox when it doesn't work anymore.