This API is available on Firefox OS for privileged or certified applications only.
Summary
The sceneMode property value is a string that defines the quality of exposure to use while taking pictures. When set, its new value must be chosen from the list of options specified by  CameraCapabilities.sceneModes.
Syntax
var mode = instanceOfCameraControl.sceneMode
Value
Return a string representing the current scene mode. The default value is auto.
Example
var options = {
  camera: navigator.mozCameras.getListOfCameras()[0]
};
function onSuccess( camera ) {
  var capabilities = camera.capabilities;
  if (capablities.sceneModes.indexOf('night') > -1) {
    camera.sceneMode = 'night';
  }
};
navigator.mozCameras.getCamera(options, onSuccess)
Specification
Not part of any specification; however, this API should be removed when the WebRTC Capture and Stream API has been implemented.