First of all, this extension does not work in Private Browsing.

And it did not stop the autoplay of YouTube, which I hate the most. Sad.

I wish Mozilla cleaned up all the old USELESS outdated Add-ons no longer updated or maintained by their creators! I downloaded this add-on a few years ago and it has never worked. I'm finally going through my add-ons inventory today to decide what to permanently delete and keep. Maybe it worked during Adobe Flash days but nowadays everything is in html5 pretty much.

does not work on Twitter in any way, AddOn not usable and therefore uninstalled! And since there hasn't been an update for a year, I wonder why Mozilla doesn't delete this senseless AddOn! and it seems to me that abuse is being committed here and the 4-5 star ratings given here are fakes!

This add-on does nothing to stop yahoo auto plays'

ALL OF THE 4 & 5 STAR REVIEWS, ARE SPAM.

NOPE. Not working. You have to go and block manually EVERY TIME you load a new page. Yet again another add-on that promisses and doesn't deliver and then my bandwidth gets eaten, anyway. I have now tried almost ALL of the add-ons that's supposed to stop this. NOT ONE. Sorry, but data is expensive here, maybe not where you are...