Didn't work at all; just sat there generating something or other.

no longer works :(

Converting these streams to downloadable formats for you needs powerful server infrastructure, therefore 1080p/mp3 downloading has been limited to PRO users.

Downloading of MP3 doesn't work on free version, so description of the extension was misleading. "Converting these streams to downloadable formats for you needs powerful server infrastructure, therefore 1080p/mp3 downloading has been limited to PRO users."

Need to pay to use

You need to pay for download 1080p

Не скачивает аудио, при попытке скачать просит купить платную версию расширения за 30 баксов

Should be an option to download High Quality for free.

I get that the video and audio streams are separate, but i can merge them myself. Or sometimes you only want one and not the other (eg audio only or video only).

Automatically launches an advertizing tab at FIRST whenever firefox is started up instead of your usual startup page.
AND the funniest thing is that the developper wants you to leave a POSITIVE REVIEW.
That's exactly what I did hoping that this advertizing tab would disappear but to no avail!
OK tell me how to remove this very annoying tab at firefox startup and I'll remove this review...
Unfortunately the only thing to be removed for the time being is nothing else but this addon...

The downloads are often very slow.

Doesnt work properly. Begs for money on every tab/page of the app. has AT LEAST 3 different sites where the app directs to.