This extension is no longer needed. Firefox already includes a setting to block media autoplay. Go to settings and search for "autoplay". Click on "Autoplay → Settings...". I suggest changing the default for all websites to "Block audio and video".

Firefox also makes it super easy to add exceptions for certain sites. Just click on the Permissions icon to the left of the address bar and it'll give you a quick drop down menu to permanently allow auto playing both audio and video or only audio.

Of course, although it is no longer necessary, I thank the author who kept this extension updated all the way until 2018. You helped a lot of us out,

Was working fine, but makes some videos unreadable (corrupt file, but ok when this plugin is disabled) really annoying.

Prevents Twitter videos from looping when they reach the end, which is what I wanted it to do. Also prevents IMDb videos from playing at all. And I suspect this extension might be somewhat CPU-heavy when simultaneously acting on multiple tabs, too.

Please fix this to work with JW player.

Would have a 5★ review if it were not for making JW Player crash out — and JW Player is the most common embedded player, claimed to be on 2 million websites. This IS fixable because as another reviewer pointed out, the rival "Video Autoplay Blocker" addon works fine with these sites — the only reason I'm not using that addon is because it often leaves its "play" button at random positions on the site I'm viewing.

Whitelist is shown in Options but can't be edited.

Via on-off testing I have determined that my HP desktop will not awake from sleep mode if Firefox is running with this extension running.

I'm glad to have this, to stop autoplay videos at Yahoo News. Unfortunately, it has no effect at YouTube, or many other media sites.

Worked great for the most of 2018. Then the videos started autoplaying again... CNN, ESPN. Uninstalled today and am currently using another autoplay disabler

I'm using waterfox, the add-on works by stopping the htm5 video autoplay, but it doesn't stop video buffering, I can live with this limitation, but the biggest issue that made me uninstalling the add-on is the add-on somehow lags the browser when enabled. FYI I have multiple tabs opened with tabmixplus add-on. Also, the toolbar button UI is a bit buggy (maybe it's waterfox compatibility issue)

I actually love your addon (I should have rated it 5 stars). The problem I have is that it's actually breaking a site that I go to heavily -- (https://www.wowhead.com). I've unchecked the site from the icon, yet the settings information does not list that the site was excluded. Actually I can't find a way to manually exclude (type in the actual url of the site) this addon from working on a particular site. This addon works like a dream to prevent sites that I visit from auto loading video. I just wish that I could keep it from working on other sites that I visit. (ie the check - uncheck boxes are not working) {{{Win 10, Firefox 64.0.2}}}

Или работает, или нет. 50%

the best solution :
https://support.mozilla.org/fr/questions/1238091
in about:config you can set media.autoplay.default to 1 in order to block automatic playback on all pages or set it to 2 to decide on a per domain basis.

Thanks to the dev for his work on this project, hopefully an update is coming. As this work is uncompensated we can't ask for much. As many have stated the add-on is no longer working.

In about:config under media*autoplay I was able to get autplay disabled. Had to create the boolean media*autoplay*disabled and fooled around with a few other strings.

Still works with other sites, but as of October 2018 it no longer is able to block YouTube.

Sadly It BREAKS with Vimeo even if disable autoplay and disable preloading are off by default. Please fix it. Otherwise very useful.

Works well for what it does. Desperately needs a way to manually add domains though. For example, I can allow old.reddit.com and www.reddit.com, but video is still blocked because it comes from v.reddit.com…

Because you can't manually add a domain, even if you know what it is, you have to figure out a way to unembed the movie so you can play it as a standalone URL and *then* allow video to autoplay from it.

Installing this extension into 163 mailboxes is a blank page. Prohibit expansion can be normal!

It works but it breaks Vimeo (black screen instead of video playing).

It works, but stopped video cannot resume.

Works more often than not, but has misses. I think maybe it generally fails when the video is in an iframe. Looks like embedded YouTube videos always play automatically. Used to work against the very annoying BBC video preview but seems not to work anymore.

It works on script clicking pause button. Very often it goes into loop and uses 100% CPU.

The pre-loading option so needs to go bye-bye.


6/8/18 EDIT: Eh, forget what I said. The add-on just needs to be updated.

A bit annoying that it has to reload YouTube page to prevent autoplay. It also doesn't let to continue playing from the stop when I switch to YouTube from embedded video on other site. Would be nice to implement it or I will be grateful for an extention which has this functionality.

It works, but on Youtube it makes the comments section disappear. Under the video it is all blank, no comments.

Works with some sites but not others. Problem with version 57+ Firefox?