To use these add-ons, you'll need to download Firefox.

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Iceggiren i audioff - audio device selector

audioff - audio device selector sɣur 希実香

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Icegger-it Aleksi
sɣur Aleksi, 4 jierren lyn
Works nicely for all sites I tested it with.
Note to all of those who say it doesn't work: Allow Microphone usage, then it will work with YouTube, etc.