WORKS FINE in Firefox on my Win10 computer and in Firefox Beta on my LG Android phone. I don't know why people give it such a bad rating.

as of 11/12/18 the addon does not work. If your on the latest version of FF, best option is to go to about:config, at the top search for autop, find media.autoplay.default, and change from 0 to 1 by right clicking the entry, and choose modify. View support page for other options: https://support.mozilla.org/fr/questions/1238091

extension seems broken. Just won't work.

NOT WORKING AFTER UPDATE.PLEASE FIX

FINALLY this worked. The prior attempts to disable website audio autoplay via about:config settings only worked on my devices, but not my desktop. This plugin did the trick and eliminating a regular source of irritation. Thanks, Afnan!

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.

Worked for a few days, now doesn't do anything anymore. Became useless.

Works perfectly, what are these people talking about?
I see people saying they miss the FlashStopper ext, this is a perfect replacement, Thank you!

This appears to work exactly as advertised. FF v. 63.0, macOS 14.0 ("Mojave")

Disappointing. Most of time it does not work.

Does not work at all.

So far, it works. We'll see.

Does nothing. Useless.

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.

Version 2018.10.3 No longer works at all. Per-domain preferences always remains empty. No longer stops Youtube videos from playing.

Rolled back to Version 2017.12.20 which does work correctly. Remember to turn off Add-on auto update for this extension.

It is (was) a nice app, but it does not work now.

Used to work fairly well. Now not at all as far as I can tell. Not even YouTube where the videos keeps on rolling.

Works very well for the most part, but like other reviewers are saying, it seems to not work for Youtube anymore.

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

Worked fine until October when youtube videos started autoplaying again.

Nefunguje na YouTube-Videá sa naďalej automaticky prehrávajú!Prosím o opravu...