help :( Puntuado con 4 de 5 estrellas

I've been using it since years ago and I love it. I wish it didn't let me rate the videos or write comments, actually since a while back it doesn't let me comment, but that's OK.
My main concern is that the videos don't play at all. I can see the icon moving, and I could even download videos I couldn't watch on youtube. Please fix it!!! I'll try to download an older version but I'm not sure if they're available or how to downgrade it :(

Esta valoración es de una versión anterior del complemento (4.9.15). 

By mistake I upgraded again, don't do it! Puntuado con 1 de 5 estrellas

I forgot when the last version was released, but as always, I didn't hesitate to updated it. It had that bug which doesn't display the possible videos to download. I had to downgrade it. Yesterday by mistake I upgraded it, I tried to stop it and I thought I was able to, BUT when I started firefox today I had the website announcing me th benefits of the update... I was hoping the bug was fixed, but it's still there!
Going back to Version 4.8.6 as I'm typing this.
I beg you, fix it already :/ This is an excellent add-on bu this last upgrade messed it up.

Esta valoración es de una versión anterior del complemento (4.9.4). 

Puntuado con 1 de 5 estrellas

I hope you're right dash66 :( Ever since the version 4.9.2 all messed up, I can't get it to work normally -.- I downgraded it to the march update. Hope it will work :/

Esta valoración es de una versión anterior del complemento (4.9.3).