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"www.google.com uses an invalid security certificate"... It most certainly does not. Most sites are untrusted.

thor314

Seems to be the same case for just about any website that I've tried, with the exception of my school that ends with a .edu address.

https://support.mozilla.org/en-US/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER?as=u&utm_source=inproduct This suggests antivirus is affecting. I have avast, not the extension for Firefox though. Shouldn't be a problem?

This sounds right: "something on your system or network is intercepting your connection and injecting certificates in a way that is not trusted by Firefox"

The issues is constant whether I'm on my phone hotspot, home internet, or cafe internet.

Advanced Deets: www.google.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. The server might not be sending the appropriate intermediate certificates. An additional root certificate may need to be imported. Error code: SEC_ERROR_UNKNOWN_ISSUER

Seems to be the same case for just about any website that I've tried, with the exception of my school that ends with a .edu address. https://support.mozilla.org/en-US/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER?as=u&utm_source=inproduct This suggests antivirus is affecting. I have avast, not the extension for Firefox though. Shouldn't be a problem? This sounds right: "something on your system or network is intercepting your connection and injecting certificates in a way that is not trusted by Firefox" The issues is constant whether I'm on my phone hotspot, home internet, or cafe internet. Advanced Deets: www.google.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. The server might not be sending the appropriate intermediate certificates. An additional root certificate may need to be imported. Error code: SEC_ERROR_UNKNOWN_ISSUER

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Check out why the site is untrusted.

  • click the "Advanced" button to expand this section to see extra details.

If the certificate is not trusted because no issuer chain was provided (sec_error_unknown_issuer) then see if you can install this intermediate certificate from another source. Click the "Add Exception" button to inspect the certificate in the Certificate Viewer.

If you can't inspect the certificate via "Add Exception" then try this:

Open the "Add Security Exception" window by pasting this chrome URL in the Firefox location/address bar and check the certificate:

  • chrome://pippki/content/exceptionDialog.xul

In the location field of this window type or paste the URL of the website with the https:// protocol prefix (https://xxx.xxx).

  • retrieve the certificate via the "Get certificate" button
  • click the "View..." button to inspect the certificate in the Certificate Viewer

You can inspect details like the issuer and the certificate chain in the Details tab of the Certificate Viewer. Check who is the issuer of the certificate. If necessary then please attach a screenshot that shows the Certificate Viewer with the issuer.

Nvm, downloaded Vivaldi, looked around for 10 minutes and I'm hooked. Good luck friends.