Firefox users need to update their browser immediately as a critical security certificate is about to expire.
Mozilla urges Firefox users to update browser immediately
The Mozilla blog revealed that on March 14, 2025, Firefox's root certificate will expire.
An expired certificate can break Firefox add-ons and extensions. An official Mozilla support document explains:
A root certificate is a trusted authority that verifies the authenticity of websites, add-ons, and software updates. When it expires, systems that rely on that certificate can no longer verify these items, which can cause features like add-ons or secure media playback to stop working.
Firefox users must update to Firefox version 128 (or later) or Firefox ESR version 115.13 (or later) to avoid the expired root certificate.
Why is it so important to update Firefox?
Basically, once Mozilla’s root certificate expires (and if you don’t update it), Firefox will become significantly more vulnerable to attack, as it will stop receiving the latest security updates. It will also likely stop receiving DRM-protected content, as the browser’s security is no longer verified.
An outdated Firefox browser can also be vulnerable to malicious add-ons, untrusted certificates, and even compromised passwords.
How to update Mozilla Firefox
If the Firefox update prompt doesn't appear, go to Menu > Help > About Firefox . If an update is available, install it, then restart your browser.
Finally, if you have trouble updating Firefox or your root certificate expires, there's an official Mozilla support forum thread filled with tips and guidance on the process.
If you need help, see our guide on how to update Firefox for detailed instructions.
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