Hello,

Please click the "Technical Details" when on the Connection is Untrusted page and compare to:

• "This Connection is Untrusted" error message appears - What to do

Try following the steps in the article above and let us know if that solves your issue.

Technical Details

support.mozilla.org uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer)

I don't use either of the secutiry software listed in the forum. I use zonealarm and did not find a SSL setting listed in it.

Can you check who issued the certificate? Please see this image for steps: https://support.cdn.mozilla.net/media/uploads/images/2014-11-23-05-50-11-63d2a6.png

• From https://support.mozilla.org/en-US/questions/1032509#answer-656530

Alternatively, you can click the padlock or globe on the left side of the address bar, followed by "More Information" and "View Certificate" to check the certificate information (if you have already connected to the site).

• How do I tell if my connection to a website is secure?

Also, have you tried following: https://support.mozilla.org/en-US/kb/connection-untrusted-error-message#w_the-certificate-is-not-trusted-because-the-issuer-certificate-is-unknown

Copying the steps from there: The file cert8.db in your profile folder may have become corrupted. Delete this file while Firefox is closed.

1. Open your profile folder:
   • Click the menu button , click help and select The image "Troubleshooting Information" does not exist.. The Troubleshooting Information tab will open.
   • Under the Application Basics section, click on Show Folder. A window with your profile files will open.
   • Note: If you are unable to open or use Firefox, follow the instructions in Finding your profile without opening Firefox.
2. Click the menu button and then click Exit
3. In Windows Explorer, click on the file named cert8.db (or cert8 if extensions are hidden)
4. Press Delete.
5. Restart Firefox.

cert8.db will be recreated when you restart Firefox. This is normal.

It reads Issued By Common name (CN) DO_NOT_TRUST_FiddlerRoot Organization (O) DO_NOT_TRUST Organizational Unit (OU) Created By htttp://Fiddler2.com

And yes, I tried the second topic you listed.

I am wondering if I should just uninstall Firefox and start over...

Reinstalling Firefox will not help for this issue. If you do not remember installing Fiddler which is causing your problem, you can uninstall it from your Windows Control Panel > Programs and Features/Add or Remove Programs list

• For information on Fiddler: https://en.wikipedia.org/wiki/Fiddler_%28software%29

If you did install Fiddler, you can add the certificate by following the steps on their web site:

• http://blogs.telerik.com/fiddler/posts/13-04-01/configuring-firefox-for-fiddler

To access the dialog in that post, you can go to:

• Tools (or ) > Options > Advanced > Network

Let us know if that helps.

Thank you very much for your time and quick responses. I had not installed Fiddler and it wasn't showing up in the uninstall listing, so I ran adwcleaner and that removed whatever was causing my issue. Once again Thank you for time. it was very appreciated.

Note that FiddlerRoot (DO_NOT_TRUST_Fiddlerroot) usually indicates unwanted software being installed named similarly to BrowserSafeguard, BrowserSafe, SafeGuard