MuteLinks is a Firefox extension designed to enhance user experience by automatically muting tabs based on specific URL criteria. It provides two operational modes: a blacklist mode that mutes specified sites, and a whitelist mode that mutes all sites except those explicitly allowed. This flexibility allows users to tailor their browsing experience to their preferences, reducing distractions from unwanted audio while navigating through the web.

The extension leverages Firefox's built-in mute tab functionality, checking each new tab or URL change against the defined criteria. Users can utilize various matching techniques, including exact matches, wildcard matches, and regex support for advanced filtering. Additionally, MuteLinks offers the option to mute all private tabs, ensuring a quieter browsing experience regardless of the selected mode.