Full text:
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Deceptive Site!

This web page at www.astraldynamics.com.au has been reported as a deceptive site and has been blocked based on your security preferences.

Deceptive sites are designed to trick you into doing something dangerous, like installing software, or revealing your personal information, like passwords, phone numbers or credit cards.

Entering any information on this web page may result in identity theft or other fraud.
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(Windows 7 Professional)
Seems to be caused by the latest version of Firefox 55.0.3 (does not happen in Internet Explorer 11)

I am hoping its a false alarm...