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.

Great, simple, well designed, practical, saved me hours !

cannot remember playback speed of each individual sites. I want youtube video to play at 1.3 but that speed carries to ALL video on ALL sites