Good for low-definition but when I tried to download a 1280p gave me this SOB story in a massive pop-up:

Youtube switched to separate audio/video streaming technology for higher quality formats and no longer provides direct 720p (Since 24 September 2018)/1080p/mp3 streams. Converting these streams to downloadable formats for you needs powerful server infrastructure, therefore 1080p/mp3 downloading has been limited to PRO users. Read more at - https://videodroid.org/pro_upgrade.html. FREE users can download all formats in CACHE where some PRO users fetched the video/audio in past 24 hours, to test the feature you can try downloading popular videos.

So, yeah, I simply tried a different Youtube downloader Add-On and 1280p was no problem for it at all - no SOB story or asking for money, just quick 1280p download.

Dishita, you have been uninstalled.

ничего не качает, только предлагает купить прем

Getting a zero (0) size file download. Broken for quite a while now, with others having same issue. Have emailed support and checked website, but no mention of a fix in-progress. Shame, because when it works, it's does what it says. Often breaking, though - which may or may not be creator's fault.

MP4 360p und MP4 720p:
Button text "pls. wait, this can take time..."
Download attempts lead to a file with size 0.

MP4 1080p (Full-HD):
Works, but sometimes with and sometimes without youtube file names.

On the so called support page it says:
"UPDATE 01-JULY-2019 : A fix v 15.3 for downloads stuck at "Pls. Wait" message is now fixed and pending mozilla's review and approval, this is expected to take upto 48 hours. You can check for latest v 15.3 here - https://addons.mozilla.org/en-US/addon/easy-youtube-video-download/ ".
The update is still not available today (11-July-2019).

nichts zum downloaden von Videos vorhanden.

This is what I'm getting when simply trying to dl mp3 128Kb from YT. I call BS. They just want money, straight from the start.
"Youtube switched to separate audio/video streaming technology for higher quality formats and no longer provides direct 720p (Since 24 September 2018)/1080p/mp3 streams. Converting these streams to downloadable formats for you needs powerful server infrastructure, therefore 1080p/mp3 downloading has been limited to PRO users. Read more at - https://videodroid.org/pro_upgrade.html. FREE users can download all formats in CACHE where some PRO users fetched the video/audio in past 24 hours, to test the feature you can try downloading popular videos."

**SCAM** Downloads non-functional, 0 byte videos. Apparently the developer has abandoned support for this add-on but is still accepting donations. I recommend using Video DownloadHelper or Youtube Downloader, both of which (at the time of this writing) are functional and free.

its not working,it says please wait,this can take time,and nothing happen,.please fix it

cannot dowonload 1080p

9 months later and it's broken yet again. Said "Working, Pls. wait for 5-25 minutes" for the last hour... and SD downloads only get 0 byte files.
My pro version also has the 0 byte problem. Developer keeps telling me it works, but broken downloads say otherwise. https://ibb.co/dfLYvFD

Terrific Add-on, non-intrusive but very easy to find and use. Looking into upgrading to PRO version.
Updated Review: Just did the latest update to this Add-on and the video does not download, it is only a 0bit maker file with no content. No chance at the PRO version now.

This plug-in used to be great. Recently, however, it breaks on a weekly basis.

When this one works, it's awesome. The problem is it rarely works.