Fix SEC_ERROR_BAD_SIGNATURE error in Firefox

Mozilla Firefox in the most prominent browser and many users love to use it with its new features. It is an open source web browser. Its frequent updates on the performance and the security features, makes it better. There are situations, where you encounter the issues with the browser as well. When you try browsing the websites on your Firefox browser, you may encounter the issue with SEC_ERROR_BAD_SIGNATURE error.

The error message appears as

Secure Connection Failed

An error occurred during a connection to. Peer’s certificate has an invalid signature. Error code: SEC_ERROR_BAD_SIGNATURE

When you try opening the same page in a different browser, it may open fine. As per our research, we have listed all the possible troubleshooting steps to fix the issue with SEC_ERROR_BAD_SIGNATURE error on Firefox browser.

How to fix SEC_ERROR_BAD_SIGNATURE error on Firefox?

Follow the below resolution steps one by one and check if the issue gets fix. If the issue remains, you can proceed with the further resolution steps.

Temporarily disable Anti-Virus program:

Issue with SEC_ERROR_BAD_SIGNATURE error mainly occurs due to the third-party programs or the security programs installed on your computer. When it comes to the resolution, we recommend you try disabling the Anti-Virus program on your computer and check if the web pages opens fine.

There are different ways to disable the Anti-Virus program. You can refer the below link and follow the instructions to disable the security program.

How to disable Anti-Virus program temporarily on Windows 10

Suppose, if the websites opens fine after disabling the security program, you can try reinstalling it. Refer the below link to download the uninstallers to remove the Anti-Virus program from your computer.

List of Anti-Virus removal tools

Reboot your computer now and check if the websites opening fine without any errors. If the issue remains, you can proceed with the further resolution steps.

Launch Firefox in Safe Mode:

Extensions or the Add-ons installed in the browser also causes different issues if they are corrupted or damaged. Sometimes, without your knowledge, some extensions will install on your computer and it may cause these kinds of issues.

In this case, try launching Firefox in the safe mode. If the web pages loads fine in safe mode, then it should be the issue with the extensions. You can check each extension and remove them manually.

To launch the Firefox in safe mode, refer the below steps:

  1. Launch Firefox browser.
  2. Click on the Menu option at the top right corner and select the option Help.

3. Now click on the option Restart with Add-ons Disabled…

4. You can now see the below prompt. Click on Restart.

5. Now, Firefox prompts the Safe Mode window. Click on Start in Safe Mode.

Check if the web pages loads fine now. If it starts working fine, then refer the below steps to manage extensions.

6. Click on the Menu option on the top right corner and select the option Add-ons. You can also open this window using the shortcut key Ctrl+Shift+A.

7. Here you can see the extensions installed. You can click on the options icon and select to Disable or Remove.

Now, close and re-open Firefox and the websites should launch fine in the normal mode as well. If the issue with SEC_ERROR_BAD_SIGNATURE error remains, you can try changing the Network Settings. You can refer the below steps to perform the same.

Change Network Settings to fix SEC_ERROR_BAD_SIGNATURE error:

If the above troubleshooting steps did not help, you can try changing the Proxy settings in the Firefox browser. You can refer the below steps to change the proxy settings on your browser. To perform the same follow the below resolution steps.

  1. Launch Firefox browser. Click on the Menu option at the top right corner and click on Options.

2. In the General section, scroll down to Network Settings and click on Settings.

3. Select the option No Proxy under Configure Proxy Access to the Internet and click on OK.

Now, close the Firefox browser and re-open it. Check if the web pages opens fine without any errors. It should work fine this time.

The above resolution steps helps you to fix the issue with SEC_ERROR_BAD_SIGNATURE error while browsing web pages on the Firefox browser. If you need any further assistance, do comments below. We are happy to assist you better.

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