1. it discovers video stream, but unfortunately sucks in downloading chunked "blob:httрs://..." to a single video file.
2. it's a kinda spamware - contains improve-voice spam with URL to their 30% discount

in general, it tries to do things VLC does best way and without any spam at all

Downloading not possible on youtube it says, it's not a good addon

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.

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.