...

    session.createStream({
        name: streamName,
        display: localVideo,
        cacheLocalResources: true,
        receiveVideo: false,
        receiveAudio: false,
        videoContentHint: "motion"
        ...
    }).publish();

FPS management in Firefox browser

By default, Firefox is publishing video with maximum FPS shown by web camera driver fo requested resolution. This value is 30 FPS for most of modern web cameras. Publishing FPS can be defined more strictly if necessary. To do this, disable constraints normalization:

session.createStream({
    ...
    disableConstraintsNormalization: true,
    constraints: {
        video: {
            width: 640,
            height: 360,
            frameRate: { max: 15 }
        },
        audio: true
    }
}).on(STREAM_STATUS.PUBLISHING, function (publishStream) {
    ...
}).publish();

Note that Foirefox can exclude the camera from the list while requesting camera and microphone access if camera driver does not provide a required combination of resolution and FPS. Also, Firefox can change a publishing resolution if there is only one resolution with required FPS in camera driver response.

Known issues

1. If the web app is inside an iframe element, publishing of the video stream may fail.

...