navigator.mozGetUserMedia has been replaced by navigator.mediaDevices.getUserMedia in Firefox 45

Firefox changes WebRTC API in the part of getUserMedia object.

Now you should use navigator.mediaDevices.getUserMedia instead of navigator.mozGetUserMedia  for Firefox browser.

Regarding Web Call Server JavaScript API, we have added a fix:

1. Web Call Server 4 and 5

wcs_api: 896.1719 / Git commit 25ac2

2. Web Call Server 3

wcs_video: 519 / Git commit f90da

See also getUserMedia API on Mozilla website.

Learn more about Web Call Server 5 – streaming video and web telephony server.