Audio Output Selector is a Firefox extension that facilitates seamless switching between audio output devices for audio and video elements. This tool is particularly useful for users with multiple audio devices, such as a TV and a headset, allowing them to customize their audio experience across different tabs. For example, you can enjoy Twitch streams through your speakers while listening to YouTube videos via your headset, enhancing multitasking capabilities.

The extension utilizes the Audio Output Devices API, which requires users to enable a specific setting in the browser's configuration. It's important to note that while the add-on effectively changes the audio output for existing elements, new elements on the page will not automatically adopt the selected audio device unless the script is rerun. This limitation may affect usage on social media platforms, but the developer is considering future updates to improve functionality.