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MOZILLAPKIXERRORSELFSIGNEDCERT - Error for Firebox Browser.Hi Team, My below code is not able to hande the attached error. It launches the firefox brows. Valet adds the certificate as 'trusted' in the OSX keychain. However - Firefox uses its own certificate manager, so doesn't see it.

What is MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT Error?

The self-signed certificate is the certificate which is signed by the same person whose identity is to be certified by that certificate. Also, in the signing procedure, the private key is signed by that certificate holder itself and not by any trusted certificate authority like DigiCert or Sectigo.

So, while trying to open the website on Mozilla Firefox, if you come across this error message “MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT” then no need to worry, as it’s one of the error message similar to Google Chrome error message “NET::ERR_CERT_AUTHORITY_INVALID” which occurs in the browser whenever,

• Jan 08, 2019 Ashish is a veteran Windows, and Xbox user who excels in writing tips, tricks, and features on it to improve your day to day experience with your devices.
• Firefox shows the 'Untrusted Connection' page with MOZILLAPKIXERRORSELFSIGNEDCERT in the technical details. If I expand the 'I understand the risks' section and select 'Add permanent exception' all the appears to happen is that the 'Untrusted Connection' page is redisplayed.

• Self-signed certificates are used
• Untrusted CA’s like WoSign, Startcom Certificates are used (One of the possibilities, though it won’t happen)

What Does Error Message “Warning: Potential Security Risk Ahead with MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT” means?

How to Fix Mozilla Firefox Browser Error Message “MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT”?

First and foremost, it’s recommended to purchase an SSL/TLS Certificate from a trusted Certificate Authority or Provider such as Comodo SSL/TLS Certificate. But, if you want to use, self-signed certificate then below are the solutions.

Note: Ignoring any errors related to SSL/TLS Certificate may weaken the security of your device. If you still want to risk anyway then avoid sharing any sensitive information like name, passwords, phone number, physical address or Social Security Number (SSN).

• Step 1: Enable Network.Stricttransportsecurity.Preloadlist
  
• Step 2: Clearing the SSL State
• Step 3: Click on “Accept the Risk and Continue” while Ignoring an Error

• In the Mozilla Firefox address bar, type about:config
• Look for “network.stricttransportsecurity.preloadlist”

• And set the last field Value to “false” and restart the browser. If you still see that error, move to below solution.

Mozilla_pkix_error_self_signed_cert Firefox

• From the windows search bar, go to Internet Options and then Internet Properties.
• Click on Content and Click on Clear SSL State option.
• Once it completes, it will display the message “The SSL cache was successfully cleared”.

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• Click on “Advanced” and then
• Click on “Accept the Risk and Continue.”

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Mozilla Firefox continues to be one of the most popular web browsers across the globe. Even during its beta phase, it was lauded for its security, speed, and efficient add-ons. However, like other browsers, it is also prone to issues. For example, many Firefox users are having trouble accessing various websites, especially those with an HTTPS prefix. Most of them get the following error messages:

• MOZILLA_PKIX_ERROR_MITM_DETECTED
• SEC_ERROR_UNKNOWN_ISSUER
• ERROR_SELF_SIGNED_CERT

It is worth noting that these error messages indicate that your web browser does not trust the integrity of the certificates issued to the websites you’re visiting. The great news is, there are still ways to access the sites. In this post, we will teach you how to fix the ‘MOZILLA_PKIX_ERROR_MITM_DETECTED’ issue.

What is the ‘MOZILLA_PKIX_ERROR_MITM_DETECTED’ Error?

If you saw this error message, it is likely that something on your network or system is disrupting your connection and certificates. Consequently, Firefox ends up distrusting the certificates. Usually, this happens when malware attempts to use its certificate to replace a legitimate certificate. As such, it is crucial that you have reliable security software on your computer to prevent this problem.

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There are many antivirus software programs out there, but Auslogics Anti-Malware is the product that can provide you with comprehensive protection. Aside from checking your system memory for malicious programs, it also scans your browser extensions. It prevents data leaks and detects suspicious items that may threaten the security of your computer.

How to Fix the ‘MOZILLA_PKIX_ERROR_MITM_DETECTED’ Issue

Most of the users affected by the problem mentioned that the issue occurred on the Nightly version of Firefox. If this is the case, then you can try using a stable build to access secure websites. However, if that does not work, you can always learn how to troubleshoot security error codes on secure websites, using Firefox. Here are the methods:

Method 1: Switching Off the HTTPS Scanning Feature

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You can configure the security options of any anti-virus software program. So, if your security software has HTTPS scanning functionality, we suggest that you switch it off. It is worth noting that you may find this feature under various names, including the following:

• Scan SSL
• Do not scan encrypted connections
• Show safe results

Method 2: Disabling the HTTPS Scanning Feature on Firefox

It is not recommended to disable the HTTPS scanning functionality on Firefox. However, this can be your last resort for fixing the ‘MOZILLA_PKIX_ERROR_MITM_DETECTED’ error.

1. Launch Mozilla Firefox.
2. Inside the URL box, type “about:config” (no quotes), then hit Enter.
3. If an info message shows up, click the ‘I accept the risk!’ button.
4. Look for the security.enterprise_roots.enabled entry.
5. Once you find it, double-click it.
6. Modify the value to ‘true’.
7. Restart Firefox.

After performing the steps above, Firefox will import all the custom certificates from other security software programs on your computer. Consequently, the process will ensure that the sources can be trusted from now on, and you will cease to see the ‘MOZILLA_PKIX_ERROR_MITM_DETECTED’ error message.

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Can you recommend other methods for resolving the ‘MOZILLA_PKIX_ERROR_MITM_DETECTED’ error?

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