The security feature works for me... FF 50... see attached image.
Just click on the black box... or try the audio version (it's useless, btw).
If you can't see the black box then it's one of your plug-ins that's the problem.
If you are using a Mac, try connecting with Safari, or IE on Windows.
Or try borrowing a PC.
All of the above will probably be easier than trying to track down contact details for someone that doesn't want to be contacted directly.
SD