audioff - audio device selector කර්තෘ: 希実香

2.1.0 update
Because of the feedback about the add-on requesting permission to access data for all websites.
Instead of setting up scripts for all pages, in this update the add-on inject the script into pages when needed.
Anyway, the add-on still have to inject scripts into pages in order to change the output device.

If you still have any concern, I suggest using this add-on as a bookmarklet.
This way you don't need to install any add-on to do the output changing.

Find more information here: Github

For Firefox ESR or previous version user
The new version of this add-on (2.0.0) only works on Firefox 92.0 and after.
You can install the old version in the version history.

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A extension to select specific audio output device for each tab.
Works on HTML5 <audio> , <video> element

You will need to enable media.setsinkid in Firefox to use this add-on.