Yup, that's a WebRTC thing.
Edit:
Safari is by far the worst browser in existence. Unfortunately we're stuck with it until the USA Congress says otherwise.
I know that "politicians suck" but we can't blame them for Safari!! Safari will stay around for as long as it serves Apple's interests. My personal choice is Firefox. But that's just me. People can use their own browsers in many/all OS, so feel free to ask your clients to use Firefox/Chrome/IE ;) and not Safari.
People/companies can always switch to Firefox/Chrome as they both have the capability for central administration.
Can you elaborate on the Firefox support issue?