Rated 3 out of 5 stars

This should be standard in Youtube. I hate when videos and audio just autoplay at random. Also, I hate that we have to make hacks to fix what Google messed up on.
But kudos to dev for doing a good job.

@Nx... honestly, the idea behind the addon is not truly unique. Or rather, not something that without a doubt *adds on* to the main resource.
Youtube could have a simple setting for autoplay on or off, but doesn't. So one has to install an addon. That's what lowers my rating.

But because the implementation is good, and addon is stable, 3 stars. Hope that makes sense.

While we are on the topic, I hardly ever give any addon 5 stars. For me 5 = many years of consistency, reliability and one that makes the FF experience what it is. I think DownThemAll is the only one I gave 5 to; if I did any other, it was a mistake/I was high on something.
1 = a waste of space. Useless
2 = good idea, implementation could be better
3 = good idea, well built app
4 = great idea, great implementation
5 = I can't live without it

This review is for a previous version of the add-on ( 

Yes, YouTube could have a simple setting to turn autoplay off. It doesn't. It's a major annoyance for a lot of people, including myself. It's not exactly an original idea to fix this, but I do honestly believe my implementation is the best out there.
You are lowering your rating based on the fact that Youtube does something stupid and that you have to fix it by installing an add-on (which, btw, doesn't even require a restart with my add-on, unlike all the others for Firefox). I don't think that's fair. You're punishing me for something that's no my fault (and yet I'm trying to fix it as best as I can!) It's not even something I can change.
Anyway, I'll grant you that it's not an earth-shattering invention that will change the world. It's just that I was surprised that you gave me such a low rating even though it seemed you were satisfied with the add-on.