How to Fix Firefox Issues with Expired Root Certificate on macOS El Capitan

Are you experiencing issues with Firefox on your macOS El Capitan system after a root certificate expired? You're not alone! This article will guide you through the steps to resolve the problem and get your browser up and running smoothly again.

First, open the Firefox settings by clicking on the top right corner of the browser. In the search box, type 'ISRG' and select 'Get info.' Alternatively, double-click on the name to access the information.

Next, navigate to the System folder in the sidebar. Open Keychain Access and drag-and-drop the certificate file onto the System folder (left sidebar). Enter your administrator credentials when prompted.

It's essential to note that you may need Firefox version 78 ESR (Extended Support Release) to be compatible with your system, especially if you don't have Firefox installed yet.

Unlike other browsers, Firefox has its own root store and does not automatically trust the root certificates of the system. This is why you may experience issues when a root certificate expires.

To fix the problem, download the ISRG Root X1 from Firefox. In my opinion, adding the new valid certificate to your Mac OS is the safest approach. You can find more solutions and quick fixes on the web or visit Let's Encrypt's full list of solutions.

Notably, some iPhones may experience issues with iOS 9 or older due to the expired root certificate. Let's Encrypt provides millions of free security certificates to enable secure HTTPS connections for websites and applications.

If you're using an older system, such as macOS precise/12.04 or squeeze/6, you may not have received a replacement certificate for the expired one. In this case, your platform is potentially affected by the issue.

The root cause of the problem lies with the expiration of the ISRG Root X1 on September 30th, 2021. As Scott Helme pointed out in his blog, this will not be the first time a root CA certificate has expired, and it's likely to follow the same trend as previous expirations.

The good news is that you can still use Firefox without any issues. For instance, PomoDoneApp works perfectly fine with Firefox, even though other browsers may experience problems due to the expired root certificate.

To summarize, updating your operating system and device regularly is crucial for maintaining security. In this case, it's essential to address the issue caused by the expired root certificate. By following these steps, you can resolve the problem and continue using Firefox without any issues.

Firefox el capitan