Hi, is this what you mean - Mute sound in Firefox tabs. It's a new feature that has just been introduced in v42.

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Thanks Scribe. This is on the right subject but the icon is continuously blinking. Clicking on it with either mouse button does nothing.

Hello,

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Thank you!

Attached is screenshot. NOTE- as stated in original question, volume icon is blinking. This does not show in screen shot.

I do not see a volume icon. Where is it in the picture?

On the page tab...upper left of screenshot.

You see that icon if there is a plugin or HTML5 media player playing sound on the tab, so if you have a lot of tabs open then you can see immediately which tabs are making sound. You can click this icon to mute the sound.

• https://www.mozilla.org/en-US/firefox/42.0/releasenotes/

New: Indicator added to tabs that play audio with one-click muting

If you want to hide this icon then you can set this pref to false on the about:config page.

• browser.tabs.showAudioPlayingIcon = false

Classic Theme Restorer: Advanced > [] Audio playing icon on tabs

• https://addons.mozilla.org/firefox/addon/classicthemerestorer/

Cor-el, how do I get to the about:config' page?'

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config

Thanks, that stopped the icon from blinking but it still remains visible. That is good enough for now. The blinking was a distraction.