Very good add-on. It makes YouTube experience more pleasant.

Easy to use and love the themes...Everything it says it does without hogging memory!!

great

Easy to use, it's simply the best one!

Very good and easy to use

This is an excellent add-on for YT. It does exactly what its name says. I makes YT more like a personal player than an online video portal.

Great Add-ons. Never crashed and I use it everyday

I use it all the time and it is just very conveniant. Thanks guys.

yes, great, only top quality here.

O que mais gosto nesta extensão é o auto-replay, que me poupa tempo e trabalho de fazê-lo pelo próprio Youtube. Em segundo o cinema mode. Os outros são ótimos, mas não os uso frequentemente. Ótima extensão para o Firefox!

Only problem I have is when I try to scroll down and lower the volume accidentally

It's a must.