Did Not Connect: Potential Security Issue Firefox detected a potential security threat and did not continue to www.google.co.uk because this web site requires a secure connection. What can you do about it? www.google.co.uk has a security policy called HTTP Strict Transport Security (HSTS), which means that Firefox can only connect to it securely. You can’t add an exception to visit this site. The issue is most likely with the web site, and there is nothing you can do to resolve it. If you are on a corporate network or using anti-virus software, you can reach out to the support teams for assistance. You can also notify the web site’s administrator about the problem. Hi I've uninstalled firefox and redownloaded several times and each time I've had the same result. I don't want to stop using firefox but unless this issue is resolved will have no alternative. Any help would be much appreciated, TIA