Mozilla has urged users to update Firefox before March 14, 2025, to avoid disruptions caused by an expiring root certificate. This warning follows an initial report by Bleeping Computer, highlighting potential security risks and functionality issues for users who fail to update.
Mozilla’s urgent warning: Update Firefox before March 14, 2025
On March 14, 2025, a root certificate essential for verifying signed content and add-ons across various Mozilla projects will expire. To prevent problems with add-ons, content signing, and DRM-protected media playback, users must update to Firefox version 128 or higher (or ESR 115.13+ for ESR users, including Windows 7/8/8.1 and macOS 10.12–10.14 users). Failure to do so may result in disabled add-ons, unplayable DRM-protected content, and disrupted systems dependent on content verification.
Furthermore, users who do not update will be exposed to significant security risks, including compromised passwords, compromised user data, and the likelihood of visiting fraudulent or insecure websites without warning. Mozilla recommends that users verify they are using the latest Firefox 128 version by navigating to Menu > Help > About Firefox.
The expiring root certificate issue affects users on all platforms: Android, Windows, Linux, and macOS. However, iOS users are not impacted due to an independent root certificate management system in place. Users of Firefox-based browsers, such as Waterfox, Tor, and LibreWolf, are also advised to update to the latest version.
To enhance data protection, Firefox users are encouraged to update their passwords utilizing reputable password managers and to consider installing robust antivirus software as a safeguard against online threats.
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Why this update is crucial
The expiration of the root certificate on March 14, 2025, means that systems relying on this certificate will no longer be able to verify websites, add-ons, and software updates. As a result, critical functionalities like add-ons and secure media playback may cease to work without an updated version of Firefox. Installing the latest Firefox version ensures compatibility with the new root certificate that resolves this impending issue.
How to update Firefox
Updating Firefox is essential before the March deadline. Users can find step-by-step instructions for updating pertinent to their platform, including Windows, macOS, Linux, and Android.
To determine if a user is affected, anyone running a version earlier than 128 (or ESR versions earlier than ESR 115.13) should check their browser version. On Desktop, this can be done by clicking the menu button, selecting Help, and then About Firefox to reveal the current version and check for updates. On Android, users can access this information through the app’s settings.
Updating Firefox will not affect bookmarks, saved passwords, or other settings; personal data will remain intact. However, syncing with a Mozilla account prior to updating is recommended for backup purposes.
Individuals can still use outdated versions of Firefox, but they may encounter issues such as disabled add-ons, problems with DRM content, and interruptions in use. Moreover, failing to update means missing critical security fixes and performance enhancements.
Not updating Firefox before the root certificate expiration could expose users to significant security threats, including vulnerabilities to malicious add-ons, unrecognized fraudulent security certificates, and compromised password alert features.
While this issue specifically impacts Firefox users on Android, it does not affect those using Firefox on iOS. Android users with versions earlier than 128 should update through their device’s app store by the March deadline.
For users of Firefox across multiple devices, each device must be updated to version 128 or higher (or ESR 115.13+) to avoid any functional inconsistencies.
Firefox ESR users need to ensure their browser is updated to ESR 115.13+ to prevent issues from the root certificate expiry. Organizations utilizing Firefox may consult their IT departments for further assistance on updates.
Featured image credit: Mozilla
