I haven't been able to figure out how to actually change the audio device once this is installed. The description says it allows me to do it, but doesn't say how. The similar audiooff add-on says to right-click on a window and select the additional menu item, and that one works for me.

This add-on works! I was able to listen to my Firefox browser privately with my bluetooth headset while my toddler is watching his cartoons from another browser using a bluetooth speaker. Just follow the instructions for this add-on to work.

Litteral gift from *insert relevent deity*