Smart Tab Mute is a Firefox add-on designed to enhance audio control while browsing. When a video is played in the foreground, this tool automatically mutes any background tabs that are producing sound, ensuring an uninterrupted viewing experience. Once the video playback concludes, the add-on restores audio to the muted tabs, allowing for seamless transitions between different media types.

Additionally, Smart Tab Mute features a whitelist for specific domains that will never be muted, catering to users who rely on audio notifications from platforms like Slack and Messenger. This customization option is set to expand with future updates, providing users with greater flexibility in managing their audio settings while using Firefox.