https://www.bleepingcomputer.com/news/software/mozilla-warns-users-to-update-firefox-before-certificate-expires/

Mozilla is warning Firefox users to update their browsers to the latest version to avoid facing disruption and security risks caused by the upcoming expiration of one of the company's root certificates.

The Mozilla certificate is set to expire this Friday, March 14, 2025, and was used to sign content, including add-ons for various Mozilla projects and Firefox itself.