Woeks great. Thanks!

Haven't had a single problem with this add-on, honestly works even better than I expected. Very well done.

It's very simple. It does exactly what it says that it does. It works perfectly.

Sometimes works, sometime not.

Mimics the diasabled media.autoplay.enabled setting in about:config but provides a needed whitelist.

It's been working well. Thank you.

I can't disable totally for a single url

OK.

Thank god for this. I was getting really annoyed with my capped bandwidth being sucked slowly through my modem because of video I didn't request. Works great for HTML5. It just puts a play icon on top of the video without starting it. You don't lose anything. Great work.

Buggy. Options don't change with mouse clicks, appear twice and have no effect.

не работает

So far it has stopped the videos from automatically running which has frustrated me since I moved to a Windows computer.

Funcionou perfeitamente pra mim. :)

nice, easy and works very well

Completely breaks the new polymer YouTube layout with the following error message:

Cannot find root node for visibility monitor desktop_polymer.js:5855:535

good !!!!!!

Don't work.

Buggy. Doesn't let me refresh https://www.youtube.com/feed/subscriptions

I was using media.autoplay.enabled flag in about:config to autostop HTML5 videos which works great.
BUT... it broke a lot of sites like Hulu, Spotify, etc.
This is great. Now I can autoblock HTML5 autoplay and still whitelist sites.
Thank you, this add-on saved my sanity.