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When Firefox connects to a secure website (the URL begins with "https://"), it must verify that the certificate presented by the website is valid and that the encryption is strong enough to adequately protect your privacy. If the certificate cannot be validated or if the encryption is not strong enough, Firefox will stop the connection to the website and instead show an error page:
Your connection is not secure
The owner of mytelstraexperience.com.au has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.