Good extension. To remove only the "muted" icon from newer firefox version (138 and up), I add to the userChrome.css:

.tabbrowser-tab[muted] .tab-icon-overlay,
.tabbrowser-tab[muted] .tab-audio-button {
display: none !important;
}

Simple to use and so incredibly useful that it makes you wonder why browsers aren't already just doing this by default. Thank you so much! Please make a chrome version!! :)

I hate sites that force you to listen to their sounds. This add-on turns that off by default. It has an optional setting to remember for which sites you enable sound so you don't have to unmute them repeatedly. Have been using it for a long time and love it. Thanks for writing it, abba23!

Is there a way to keep the site icon in tab, instead of having every one be muted icon?

Also an alarm addon I use got muted as well. I have tried to add it to whitelist but no success. Any way to solve this?

Sehr praktisch, einwandfreie Funktion

Thank you so much - muting domains instead of tabs was the number one Chrome feature I missed. This extension does exactly what I wanted and improves my browsing experience a lot.

I just added this to userChrome.css to remove the ugly "MUTED" label by Firefox:
.tab-secondary-label[muted] {
display: none !important;
}

When I press ctrl+m it mutes/unmutes multiple tabs from the same domain, even though they have different subfolder address. I expected only the current tab to be affected and keep every other tab muted. Would be nice to have different keybinds to whitelist domain and mute/unmute current tab.

Thank you. Works well.

However, with most/all tabs muted, the "muted" icon next to each tab is taking space, it's visually noisy and it hides/replaces the site icon.

Remedy: Hide "muted" icon unless a tab is currently playing sound.

How? create "userChrome.css" file with the following content:
@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);
.tab-icon-overlay:not([soundplaying]) {
display: none;
}
.tab-icon-image:not([soundplaying]) {
opacity: 1 !important;
}

Save that file in chrome folder right under your Firefox profile folder. To locate that, open Firefox special URL about:support and see "Profile Directory". See also https://www.reddit.com/r/FirefoxCSS.

As someone who forgets he left his speakers on, this addon has been a lifesaver.

Doesn't work anymore. Not sure why, not going to troubleshoot because an alternative is already working without issue, thanks for the last few years though!

This is great for those annoying mini videos that play on sites that you visit to download a freeware program. They pop up telling you how to install the same kind of programs over and over again its annoying. So this really helps with those videos.

An essential add-on for Firefox. Congratulations on your great work.

Simple and good! Needed this very much.

needed this so bad , instagram for some reason thinks its ok to blow out your eardrums