As another poster said, it doesn't work on Firefox for Android. There is no way to save settings. I can add sites to the blacklist or whitelist, but they aren't getting saved. Same if I select mute by default or mute private tabs - the settings don't save and there is no save button.

Doesn't work in Firefox for Android

Useful but needs ability to export/import settings (blacklist, whitelist, etc)

It works well with a blacklist, but muting by default and using a whitelist is much more problematic. Reloading a tab, using the reload button or Ctrl+R, always results in a muted page even if the site is whitelisted. Sometimes rules don't work as described, e.g. "google.com" doesn't also whitelist "calendar.google.com". And nothing I do seems to be able to unmute "about:newtab" (which would be nice just for aesthetics). The advertised regex support doesn't seem to work at all for the whitelist.

I'm giving it three stars because it does work great with the blacklist. But I wasted a lot of time trying to get the whitelist to work.

It works... usually. Most of the time. There are a decent number of ads that still manage to play sound through this addon.

It works pretty well.

One bug in Firefox Quantum though. I have it set to Mute By Default with sites like youtube whitelisted. It works well if I open a Youtube link in a new tab for instance, it's not muted. Which is the behavior I'd expect.

But if I open a new blank tab, that tab is muted. If I then navigate to Youtube, it doesn't unmute that tab.

So basically it only works if the tab is opened directly to a site that's on the Whitelist.

Edit:
I also get the same bug as the other users where if I hit the Blue trashcan in the settings to remove a site, it freezes the whole settings panel.

This extension rocks! It works perfectly.

It works well. I used it to mute Twitch's frontpage streamers.

This is a good extension to have but I am experiencing the same thing as nowix where in the settings where you can whitelist and blacklist, whenever I add a link and try to add another or delete it, it freezes. Please fix this as soon as you can I really need this addon.

Great work, thanks. I have a bug on the addon settings panel : when I click on the blue trash icon of any url, the entire settings page freezes and doesn't respond until I reload it. I can't remove url I added.

Going back to a different URL in the same tab doesn't unmute.

I have googlevideo.com as a blacklist site. I return to "youtube.com" and the tab is still muted. That's not what I intented to achieve.

Thanks for this nice addon!

I checked mute all by default, nothing on white list
And when I open a new tab, Youtube for exemple, it's not mute.
What am I doing wrong ?

edit : Ok thanks for the fast reply :)
when you said that I should see a mute icon, I thought about incompatibility with another addon. I found it, it's Tree Style Tab version 0.19.2017061601. When I disable it, your addon works. Weird because I tried another mute add on "Mute Tab" I think and the icon appears in each tab and it's functional. Only thing it appears only when sound's playing, so I can't mute if sound is short.
Do you think it's a bug in Tree Style Tab or in you addon ?

Thanks for this addon and the update to webextensions. Glad to see that this addon will survive come FF57.