Firefox Audio Output Selector Add-ons

What is the essential answer to my configuration question?

Firefox does not currently ship a built-in per-tab or per-site audio output selector in the main browser controls. Audio destination is usually chosen by the operating system, not by the browser. An add-on named Firefox Audio Output Selector may exist, but its actual capability depends on the host platform and browser version, and it cannot grant Firefox control that the operating system does not expose. The direct configuration step is therefore to treat the system sound settings as the primary place to select an output device.

Where Firefox audio routing actually happens

Audio output in Firefox is closely tied to the operating system audio stack. On Windows, macOS, and mainstream Linux desktop environments, applications are assigned to an audio device through the system sound control. Firefox appears there as one application stream, not normally as separate streams for each tab. This means a user who wants Firefox sound to move from speakers to headphones, or to a USB audio interface, usually changes that assignment in the system sound settings.

What an add-on can realistically provide

A Firefox audio output add-on may offer a toolbar button, a menu of known devices, or a shortcut that opens the relevant system sound page. The usefulness of the menu depends on the platform. If the operating system exposes a complete device list to the browser, the add-on may be able to request or display that selection. If it does not, the add-on may be limited to a shortcut that opens the system settings where the real change is made.

How to configure audio output without relying on extension tricks

• Open the system sound or audio output settings for the current platform.
• Start playing any sound in Firefox so the browser appears as an active audio source.
• Select the intended output device for Firefox from the per-application mixer, if available.
• If no per-application mixer is available, change the default system output device and restart Firefox playback if the stream does not move immediately.

Platform differences that affect the add-on

Windows commonly includes an app volume and device preferences panel where output can be changed for a running application. macOS generally routes the whole browser through the selected system output device, with more granular control available only through third-party system utilities. Linux behavior varies by desktop environment and audio server, so an add-on cannot promise identical device switching across all supported operating systems or versions.

Practical interpretation and limitations

The practical takeaway is to treat an audio output add-on as a convenience layer rather than a replacement for the platform sound settings. If the add-on shows a device list, the selection is still ultimately constrained by what the operating system reports to Firefox. If the add-on only opens system settings or acts on the default device, that is not a missing feature in the add-on; it is a boundary in the browser platform integration.

Gaps and unresolved variation

The available information does not specify a guaranteed exact add-on behavior for every current Firefox version and operating system combination. A reader should check the add-on's platform notes and test it against the system audio control, because documented behavior may differ from what a particular desktop environment or managed device policy permits.