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Why is my recently updated Firefox for Mac rejecting almost every site (almost all of them known to me) as "not secure"?

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I'm using Chrome to research this problem because my Firefox browser (for Mac), just updated, is suddenly telling me that every site I try to connect with is "not secure." I already know most of these sites and there is nothing wrong with them.

Sometimes Firefox allows me to override the warning and connect, sometimes not. The security settings don't contain anything that enlightens me or allows me to correct this problem.

Does anybody know a solution to this? I switched from Chrome to Firefox because my copy of Chrome got infected with something called "weknow," which mimics Google and which I haven't found any way to purge. So if anybody has an answer to that, please let me know.

I'm using Chrome to research this problem because my Firefox browser (for Mac), just updated, is suddenly telling me that every site I try to connect with is "not secure." I already know most of these sites and there is nothing wrong with them. Sometimes Firefox allows me to override the warning and connect, sometimes not. The security settings don't contain anything that enlightens me or allows me to correct this problem. Does anybody know a solution to this? I switched from Chrome to Firefox because my copy of Chrome got infected with something called "weknow," which mimics Google and which I haven't found any way to purge. So if anybody has an answer to that, please let me know.
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Additional System Details

Application

  • User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

More Information

FredMcD
  • Top 10 Contributor
4120 solutions 57521 answers

Chosen Solution

There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connection certificates and send their own. https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message https://support.mozilla.org/en-US/kb/connection-untrusted-error-message [https://support.mozilla.org/en-US/kb/websites-dont-load-troubleshoot-and-fix-errors?redirectlocale=en-US&redirectslug=Error+loading+web+sites Websites don't load - troubleshoot and fix error messages] http://kb.mozillazine.org/Error_loading_websites [https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean What do the security warning codes mean]
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cor-el
  • Top 10 Contributor
  • Moderator
17185 solutions 155308 answers

You can check if there is more detail available about the issuer of the certificate.

  • click the "Advanced" button show more details
  • click the blue error text (SEC_ERROR_UNKNOWN_ISSUER) to show the certificate chain
  • click "Copy text to clipboard" and paste the base64 certificate chain text in a reply

If clicking the blue error text doesn't provide the certificate chain then try these steps to inspect the certificate.

  • open the Servers tab in the Certificate Manager
    • Options/Preferences -> Privacy & Security
      Certificates: View Certificates -> Servers: "Add Exception"
  • paste the URL of the website (https://xxx.xxx) in it's Location field

Let Firefox retrieve the certificate -> "Get Certificate"

  • click the "View" button and inspect the certificate

You can find detail like the issuer of the certificate and intermediate certificates in the Details tab.

You can check if there is more detail available about the issuer of the certificate. *click the "Advanced" button show more details *click the blue error text (SEC_ERROR_UNKNOWN_ISSUER) to show the certificate chain *click "Copy text to clipboard" and paste the base64 certificate chain text in a reply If clicking the blue error text doesn't provide the certificate chain then try these steps to inspect the certificate. *open the Servers tab in the Certificate Manager **Options/Preferences -> Privacy & Security<br>Certificates: View Certificates -> Servers: "Add Exception" *paste the URL of the website (https://xxx.xxx) in it's Location field Let Firefox retrieve the certificate -> "Get Certificate" *click the "View" button and inspect the certificate You can find detail like the issuer of the certificate and intermediate certificates in the Details tab.
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