I'm trying to do my first-ever virtual medical office visit. Using the "test audio & video" feature in the provider's website, Firefox finds the camera and microphone in my webcam, but does not list any speakers. (Nothing happens when I click "Select Speaker".) I only have one device for audio output, the system default, and sound plays successfully in other applications. The videoconferencing site works in Microsoft Edge, which does find my speakers and plays a test sound. media.setsinkid.enabled is set to True. I'm using Windows 11 and Firefox 131.0.