Bewertet mit 1 von 5 Sternen

Didn't work in my FireFox 34.

Perfect Bewertet mit 4 von 5 Sternen

It works with Firefox 26.0, also with Youtube Center. But there should be an on-off switch.

Bewertet mit 2 von 5 Sternen

it doesn't work in my firefox 25.0.1. scroll and video window goes out of view

Please feel free to contact me on Support E-Mail mentioned on extension's AMO page. I need to understand why it is not working for you.