Works like a charm thank you!!

As advertised.

I obligatorily have to remove one star as the preview speed doesn't round floating point properly. haha

Świetnie działający dodatek do przyśpieszania video z rewelacyjnymi dodatkowymi opcjami wyboru takiego przyśpieszenia jakie się chce.

nice great job!

Nice, customizable and easy to use. It's the best video speed controller that I tried. I recommend it.

Nice

Work Well

I can no longer enjoy it as it is no longer visible; no icon.
It shows up under add-ons, but not in Firefox.
The speeds are also listed on the add-ons page, but are grayed out and can not be edited.
I checked script-block to see if it was blocking it but was told that the page was privileged and could not be edited.
A similar utility works well on Chrome.
Had to reinstall. Now it seems to work...