ダウンロード速度は非常に遅いけれど、他のアドオンではうまくダウンロードできない動画もきっちりダウンロードしてくれます。他のダウンローダーと合わせてインストールしておくと、他のがうまくいかなかった時のフォローができて安心です。

What is the point if it doesn't appear in drop-downs and can't be added to the Toolbar?

Would not download a video from a popular site, 'not possible through the add-on', points to some Premium product that can handle 'M3U8' material that other Add-ons can handle by themselves.

Wow...a downloader that actually works.
I tried so many others that don't work at all or they only show a list of small clips of the video, or they require additional software to be installed.
This one shows the full video and the size of the file and downloads fast!....Thanks!

It is no a downloader. Period. I don't know why it need your browsing history. It is just a dangerous add-on.

Not working.

doesn't work on private youtube videos at all...