Mozilla has issued an urgent warning to Firefox users to update their browsers before March 14, 2025, when one of the company’s root certificates will expire. This certificate, which validates approved add-ons for Firefox, could cause significant disruption and security vulnerabilities if users remain on outdated versions.

## Required Updates

– Regular Firefox users: Update to Firefox 128 (released July 2024) or later
– Extended Support Release (ESR) users: Update to ESR 115.13 or later

## Security Risks of Not Updating

Failing to update could expose users to several critical security issues:

– Malicious add-ons could bypass security protections, compromising user data and privacy
– Untrusted certificates may allow visits to fraudulent websites without warning
– Compromised password alerts may stop functioning, leaving users unaware of potential account breaches

## Affected Platforms

The certificate expiration affects Firefox on all major platforms:
– Windows
– Android
– Linux
– macOS

iOS users are not affected due to its independent certificate management system.

## How to Update

Users can verify their Firefox version and update by:
1. Opening the Firefox menu
2. Selecting Help > About Firefox
3. The browser will automatically check for and apply available updates

Mozilla strongly advises against continuing to use older versions after the certificate expires, as functionality may be severely impacted even if users accept the security risks.

Users of Firefox-based browsers such as Tor, LibreWolf, and Waterfox should also ensure they’re running versions based on Firefox 128 or later.