Mozilla has released security updates to address security vulnerabilities in Firefox, Firefox ESR and Thunderbird. An attacker could exploit some of these vulnerabilities to trigger arbitrary code execution, security restriction bypass, sensitive information disclosure and spoofing on the targeted system. Security vulnerabilities fixed in Firefox 143, Firefox ESR 115.28, Firefox ESR 140.3, Thunderbird 143 and Thunderbird 140.3.

More information on vulnerabilities and updates is available in Mozilla security advisories:

• MFSA 2025-78

• MFSA 2025-77

• MFSA 2025-75

• MFSA 2025-74

• MFSA 2025-73

Source: mozilla.org