Ref# ADV2025_443 | Date: Dec 22nd 2025

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Mozilla published a security advisory highlighting vulnerabilities in the following product on December 18, 2025. It is recommended that you take the necessary precautions by ensuring your product is always updated. 

• Firefox – versions prior to 146.0.1 

For more information on this update, you can follow these URLs: 

• Mozilla Foundation Security Advisory 2025-98 

• Mozilla Security Advisories 

The Guyana National CIRT recommends that users and administrators review this update and apply it where necessary. 

References 

• Mozilla Security Advisory (December 18th, 2025). Retrieved from Mozilla. https://www.mozilla.org/en-US/security/advisories/mfsa2025-98/ 

• Mozilla Security Advisory. (December 18th, 2025). Retrieved from Canadian Centre for Cyber Security. https://www.cyber.gc.ca/en/alerts-advisories/mozilla-security-advisory-av25-849