Firefox won't access my webcam in Google Meet; will access it for other sites 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.



But on onlinemictest.com, Firefox lists both cameras:



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
It seems that Google Meet is choosing camera using it's own form, unlike the other websites (i.e. mentioned onlinemictest.com).
To access this form from the lobby:

click on the &quot;three dots button&quot; (⋮)
choose &quot;Settings&quot;
select &quot;Video&quot; tab
you should be able to select different WebCam, i.e. your Logitech USB WebCam