[FIXED] “YOUR CONNECTION IS NOT SECURE” Mozilla Firefox Browser Error

Mozilla Firefox is a popular browser because it verifies the validity of website certificates in a more effective way than any other browser. It also checks the encryption is strong enough to protect your privacy. As you might already know, the link starts with HTTPS uses SSL certificates. This means that the Internet Security protocol is being used while sending or receiving data to and from the website. But if the certificate is not valid, the browser starts showing an error like Your connection is not secure on your screen. Don't worry, I've listed a couple of steps which will help you resolve this problem. Fix "Your connection is not secure" Mozilla Firefox Browser Error
Firefox user used to ask these questions to Google; How do I fix secure connection failed in Firefox? How do I get rid of this connection is not secure error? How do I fix certificate errors in Firefox? How do I add exceptions to Firefox certificates? How do I add a security certificate to Firefox? How do I get rid of certificate errors in Firefox? And so on.

Usually, the message is;
"Your connection is not secure"

"The owner of www.example.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox only connects to it securely. As a result, it is not possible to add an exception for this certificate."
There is much information that hackers can get unauthorized access to the Internet over insecure connections. Privacy, personal information & credential are the most important things. You require to secure personally from hackers by using secured connections.

There are few possibilities that cause the error in Firefox that includes, your system date, & time is not updated, Antivirus is not configured correctly or the malware intercepting the secure connection. Here I have list 5 steps using which you can easily fix the not secure connection error in Firefox.
[FIXED] "YOUR CONNECTION IS NOT SECURE" Mozilla Firefox Browser Error
Also, if you haven’t read '6 Best Ways To Make Firefox 10x Faster than Chrome: AIO [about:config]', I highly recommend checking it out before going any further.

Fix "Your connection is not secure" Mozilla Firefox Browser Error

These are the best ways which will help you resolve this 'Your connection is not secure' issue from your Mozilla Firefox browser:

Step 1: Disable the “Warn about certificate address mismatch” option.

1. Navigate to Start > Control Panel option.

2. Open Internet Options and go to Advanced tab.

3. Search for Security section.

4. Search for Warn about certificate address mismatch* checkbox and uncheck it.
Disable Certificate Address Mismatch Setting
Disable Certificate Address Mismatch Setting
5. Apply and save the changes.

6. Finally, restart your firefox and check if solves your problem successfully.

Step 2: Disable SSL3 Preferences.

1. Type about:config in Firefox browser address bar.

2. Click on I accept the risk! button when prompted.

3. Type ssl3 in Search field and hit Enter.

4. Search for security.ssl3.dhe_rsa_aes_128_sha and security.ssl3.dhe_rsa_aes_256_sha items.
Disable SSL3 Preferences
Disable SSL3 Preferences
5. Double click on both to switch them from True to False.

6. Now open Help > Troubleshooting Information from the browser menu option.

7. Click on Open folder button.
Open Firefox Profile Folder
Open Firefox Profile Folder
8. Close all Mozilla Firefox browser windows.

9. Run cert8.db and cert9.db files.
Run cert8.db and cert9.db files
Run cert8.db and cert9.db files
10. Launch Firefox browser and check if this fixes the problem.

Step 3: Enabling “auto-detect proxy” and Refreshing Mozilla.

1. Navigate to Tools > Options > General section.

2. Scroll down to Network Settings or Network Proxy section.

3. Click on Settings button.

4. Check Auto-detect proxy settings for this network radio button and click Ok button.
Disable Auto-detect proxy settings for this network
Disable Auto-detect proxy settings for this network
5. Just restart Firefox browser and check if this could solve your problem.

6. If it doesn't solve your problem, Navigate to Help > Troubleshooting Information from the browser menu option.

7. Click on Refresh firefox... button.
Refresh Firefox
Refresh Firefox
8. Your browser will be re-started with No add-ons and default browser settings.

9. Now check if your problem gets resolved by this.

Firefox Booster - SpeedyFox | Quickly Make Firefox Run Faster

[Fix] Make Computer Run 10x Faster By Using Virtual Memory | RAM Optimization

Step 4: Enable "security.enterprise_roots.enabled" settings.

1. Type about:config in Firefox browser address bar.

2. Click on I accept the risk! button when prompted.

3. Type root in Search field and hit Enter.

4. Search for security.enterprise_roots.enabled item.

5. Double click to switch it from False to True.
Enable Security Enterprise Roots
Enable Security Enterprise Roots
6. Restart Firefox browser and check if this fixes the problem.

Step 5: Correct system date and time.

1. Navigate to Start > Control Panel option.

2. Click on Date and Time option.

3. Click on Change date and time button.
Correct System Date and Time
Correct System Date and Time
4. Select timezone from available ones and apply changes.

5. Now launch Firefox browser and try launching the URL if it's loading without any issues.

DIY Steps

1. Disabling Antivirus Software: Sometimes, an additional layer of security to your browser is usually given by antiviruses. So, you probably need to resolve this issue by disabling SSL or by disabling any other browser scanning options from your antivirus program. Here, you have to see if there are any settings in your antivirus which might be adding this extra layer of security to your certificates.

2. Re-install Firefox browser: If you are still having problems accessing websites even after implementing all the above steps, just export your data and re-install your Mozilla Firefox browser and import everything back again. I hope this might be one the last option to solve this issue.

3. Clear browsing history: This could be another but simple solution to this problem. Try clearing cookies and/or caches from the browser and check if you could solve this problem.

Bottom line
I’m sure by following any one of the methods from listed ones will help you resolve the error.

If you are facing this error or something you want to suggest apart from the above points, feel free to use below comment section to get in touch with me anytime. Happy to hear from you and to implement the suggestions for helping others.

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Vinayak SP
Authorised by: Vinayak SP

I'm a writer, digital columnist, tech-savvy and an engineer all rolled into one. Yes, that pretty much what everyone likes to call a geeky friend or what you’re probably here seeking, a content writer. You can follow me on the social media or subscribe the email newsletter for the updated guides and tutorials. Regularly publishes news articles about blogging tips, SEO, making money online, Adsense optimization, web hosting, affiliate marketing, & tech reviews.

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