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About this Add-on
As of Firefox 42, tabs have a new audio indicator icon when the tab is producing sound. If you would like to remove it, go to "about:config" and toggle "browser.tabs.showAudioPlayingIcon" to false
As of Firefox 57, the code that this addon is based on is no longer supported. The current functionality cannot be achieved in the new code. The closest alternative involves automatically pinning all tabs (Autopintab: under patterns add .* and enable regular expressions)