How to switch a camera or a micriphone used by the browser
On any page that uses your camera or a microphone there is an option which rules devices available with an icon of videocamera in the address line. There you may allow access to the camera and a mic if it is blocked and change chosen mic and camera in proper drop-down lists.Pay your attention to the words below this window: To make these settings work you should reload the page! You can do it clicking the button in the kind of turnover the arrow or on F5 button on the keyboard.
You can test connection and devices on this page.