Firefox won’t access the webcam in Google Meet; will access it for other sites

firefoxwebcam

I have two webcams: One built into my laptop, and an external one attached over USB. When I go to meet.google.com, Firefox only allows me to access the internal webcam. When I go to other sites, Firefox gives me the choice of both cameras. How can I use my external webcam with meet.google.com?

My external webcam used to work with meet.google.com. It stopped working about a week ago —- I'm not sure if Firefox updated around that time.

This is the permissions box I get on meet.google.com. Only the internal camera is listed.

google meet permissions

But on onlinemictest.com, Firefox lists both cameras:

enter image description here

Here are the things I've tried:

  • Cleared cookies and site data
  • Went to Preferences -> Privacy and Security -> Permissions -> Camera, and removed meet.google.com, to force it to ask for permission again.
  • Rebooted
  • Checked the Security and Privacy system preferences

I'm running macOS 10.14.6 and Firefox 76.0.1

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