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.

This blocks a lot of videos, and even entire channel pages, from loading in YouTube. Even if you tell it to not block anything on the page you are on, it still prevents them from loading. I am disabling this addon for now, I will remove it entirely if it isn't updated in a timely manner to not do this in FF 57.

it's a stupid addon,if you let it on,it stop the player when you click the play button over and over

Seems to work for me...it does break some websites--but so does the built-in FIrefox preference in about:config. This at least lets you whitelist sites that break...

Really this addon shouldn't be necessary--Mozilla should add click-to-play html5 video built-in, like they have for Flash...

Fait bugger beaucoup de choses, à commencer par les vidéos elles-même et rends les userScripts (via GreaseMonkey) totalement inutilisables.

Doesn't seem to prevent autoplay at most sites. Not even at big sites like Youtube - you'd think that it would be the first place to test an add-on like this, but oh well.

Can't play videos at all with the add-on enabled now.

BLOCK TWITCH FROM AUTOPLAY VIDEO BUT THEN I CANT START THEM...

it doesnt do anything at all