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About this Add-on
This add-on is based on the “Smart Tab Mute” Chrome extension by @neuling2k. I adapted the original extension to make it compatible with Firefox.
Like the original Chrome extension this add-on supports a whitelist of domains which will never be muted (useful for sites using audio notifications like chats etc.). Currently this whitelist contains slack.com and messenger.com. With the next version of Firefox (48, scheduled for August 2016) it will be possible to customize this whitelist.