Reset Firefox Permissions (Mobile/Tablet)
What to do if camera or mic access was denied on Mobile/Tablet
If device’s camera and mic was accidentally denied access then it is required to reset the device permissions.
How to reset Firefox permissions
Open your device's Settings app.
Go to Apps & App permissions.
Select Firefox from your list of installed apps.
Open Permissions and ensure your camera & mic are toggled on.
Restart your Firefox app before logging in or re-entering the waiting room.