EDIT: 09/06/2020
Issue has been fixed. 5 star extension, should be standard.

EDIT: 23/11/2017
Issue persists; check
https://sites.google.com/a/duneland.k12.in.us/sites-tutorial/add-a-calendar-to-your-site#TOC-EXAMPLE-CALENDARS

The full width and half width calendars fail to show up with the extension enabled, but work fine with it disabled. Blacklisting the websites works, but it's strange as to why this happens at all. Doesn't happen with the Chrome version of this extension.

Odd - prevents embedded Google Calendar from displaying properly. Otherwise, works on video websites.

Extension works as intended, however some keyboard keys are taken over by Firefox and thus can't be mapped to controls in this extension.

Props to active developer for reading comments.

Works on Android Firefox..stable version Nov 2017.

:)

it saves time

You can easily manage the video with this web tools.

i can watch faster now

Please put an option where you don't affect pitch when you change speed, sometimes i like to listen to song in lower pitch but I can't do it with this addon since it has pitch correction

I always wanted to be able to go faster than 2.0x on videos during the parts I already have seen or know. You can go as fast as you want with this tool. The best

I use it on nearly every website which has videos and it saves me so much time and frustration.

I love it. Helps me save hours and hours of time, works great. I'm so happy to see it for firefox.

It does what it says and it's simple to use. You can change youtube video speed. It's excellent!!!

Отличное расширение! Теперь можно получать больше пользы от просмотра Ютуба.

The only addon forced me to use chrome is available on firefox now!