SEC_ERROR_BAD_SIGNATURE Error code in Firefox

The Secure connection failed with code SEC_ERROR_BAD_SIGNATURE It is displayed to Firefox users when they try to access any website using the browser. But users reported that these websites were easily accessible without problems in other browsers. Once you see this error, you will not be able to access any trustworthy website like Facebook.

Possible causes of this error are:

• Incorrect browser network settings
• Third-party applications or antivirus software installed on your system
• Browser extensions or add-ons

If you are one of them facing this problem with your Firefox browser, read this article to know the solutions suggested by other users to overcome this error.

Solution 1: disable third-party antivirus

Many users have found that third party security software It blocks your system from connecting to the Internet and, in turn, prevents access to websites. So open your antivirus program and look for the option to deactivate that. Once you disable the antivirus program, restart your browser and check if you can access the websites without any errors. If this works for you, you must add an exclusion to the network settings of your antivirus program.

Solution 2: open browser in safe mode

1. Open Firefox.

2. Select the three horizontal lines button to open the application menu in the upper right corner.

3. From the menu that appears, choose Help.

4. Click Troubleshooting mode … at Firefox Help menu.

5. Firefox now asks if you want Restart Firefox in troubleshooting mode?

6. Click the Restart button.

7. Now click on the Opened in the window asking if you want to open the browser in troubleshooting mode or not.

8. The browser now restarts in safe mode with all extensions and custom settings disabled.

9. Check if the problem is resolved.

If this helps to fix the problem, then you need to uninstall the browser extensions one at a time and find the one that was causing this problem.

Solution 3: disable browser proxy settings

1. Start the Firefox browser.

2. Type about: preferences in the browser’s address bar to go to the Settings page.

3. You will be in the General tab. In the search box, type Red search for Network Configuration.

4. In the search result, click the Settings … button associated with Network Configuration.

5. Select the radio button next to Sin proxy at Connection settings window.

6. Click it’s fine.

7. If any tabs are open, close them.

8. Relaunch Firefox and check if the error is resolved.

Solution 4: change the trust settings of the installed certificate

1. Open the Firefox browser and type about: preferences in the address bar to open Settings.

2. Clean your browser history following the steps below.

• In the search box, type history.
• Scroll down to History and click on the Delete history … button.

• In Clear all history window, select Everything in the drop-down menu associated with the Time interval clean up.
• Cheque all the boxes under the History Y Data section.
• Click on it’s fine.

3. Once the history is cleared, return to the Settings page.

4. Select the Privacy & Security tab.

5. Scroll down and find the Certificates section and click See certificates …

6. In the Certificate manager, Go to the Authorities tab.

7. Here the certificates are listed in alphabetical order. Select the specific certificate based on the website providing the problem.

8. Click Edit trust … button at the bottom.

9. In the Edit the trust settings of the CA certificate window, make sure cheque both options This certificate can identify websites Y This certificate can identify mail users.

10. Then click it’s fine.

11. Now go to the address bar of the browser and try to access the site that was throwing this error. Check if the problem is resolved.

Note: if this is the first time you have made such a change to the certificates, Firefox will warn you with a message Potential safety risk in the future. If you trust the site, click Advanced and then Accept.

That’s it!

We hope that you were able to access the required websites in your Firefox browser without seeing the SEC_ERROR_BAD_SIGNATURE error code. Please comment and let us know the solution that helped you overcome this problem.