In its IP / DNS Leakage Detector (the blue “lock” icon at upper right) the tab “Disable WebRTC” says
In order to prevent WebRTC leaks, Uncheck WebRTC option under Settings > Security. Click here to see settings
Unfortunately, there is no WebRTC option under Settings > Security and the “here” link (chrome-extension://gjecojhgmbeijhiddahpjiplnpllmomd/ip_dns_page.html#) says “No matches were found.”
A follow up: WebRTC is enabled in Dragon, so the option to disable it needs to work.
In particular, Dragon is providing my computer’s address on my local network to remote web sites. For example, the Web page http://whatismyipaddress.com/webrtc-test detects and shows its address on the local “non-routed” 192.168 subnet, which is behind my NATing router.