How can I access the notebook camera from firefox addon?

Question

I really need my addon can access the notebook camera if it does exists.

Answer 1

In order to access the webcam in Firefox (and more generally in supporting browsers), you should use navigator.getUserMedia

Prompts the user for permission to use a media device such as a camera or microphone. If the user provides permission, the successCallback is invoked on the calling application with a LocalMediaStream object as its argument.

Here is a tutorial on MDN about taking webcam photos.