Works really well, only issue I have is even when I blacklisted the extension from working on Twitch, it still randomly makes streams play in 1.03 speed which causes the audio to artifact hard.

Real time saver!

Exelente extensão ajudando na produtividade de aceleramento de videos poupando tempo. nota 10

Great Time Saver!
You can also do the same thing using Java Console, but its very simple to use.
Mostly you need to modify the shortcuts according to your convenience.
BIG THANKS to the Developer :)

Needs per-domain persistence, not global

Please, update the version to 0.5.8 as in chrome. The most useful addon I've ever seen..

You can control with shortcuts, but buttons such as + and-are not displayed.
Do I need to do anything?

Great, even works on firefox built-in player, thank you ! Could you have it work on dailymotion too ? They changed their design recently, I suppose that's why the addon doesn't work as the last update was earlier.