UPDATED 14 MAY 2020 The long train and plane rides are on hold because of coronavirus, but this app still serves me really well to download videos that I need to share for Zoom meetings, better than trying to share from YT
-----------
this really works! seamless, convenient, no fuss, just what i need to view what i need while commuting, especially long train and plane rides

Gave a $15 donation after joining because I was getting 1040p downloads. A few weeks later I could not even download 780p with the following message that I need "pro":
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.

Love this add-on. Fast, easy and works every time!

Developer is currently working on a fix for the May 7 missing drop down menu. This is a wonderful service, highly recommended.

good application!!

Sometimes processes videos to MP3 format a bit slow and occasionally downloads a blank .mp3 file repeatedly. With all the extensions I have that might be on my end. :)
Had trouble with it staying activated and lost my confirmation link. 2nd time I contacted the dev I got another one and didn't even see it inside the reply so I complained some more. I am the idiot here. :)

gut

сразу просят деньги

This app does not support HD downloads, only 720p. For HD, you need to pay for the premium version of this app.

Shit addon, just there to grab your money. If you want anything better than potato, this is not the addon for you. I'd wager most of the reviews and installs are faked

Funktioniert nicht. Bei Benutzung wird man aufgefordert, eine Pro-Version zu kaufen.

非常好用，我的浏览器重装以后不能下载1020P了，一封邮件，三个小时就搞定了，赞！

It asks for money for full HD resolution or higher.

Also, the following page:

https://support.mozilla.org/en-US/kb/permission-request-messages-firefox-extensions#w_access-your-data-for-all-websites

The extension can read the content of any web page you visit as well as data you enter into those web pages, such as usernames and passwords.

I think that "Best Youtube Video Downloader" for me. thank you so much ;D