Mozilla has extended support for its Firefox browser on Windows 7 and 8.1 until September 2025. This follows the introduction of its Extended Support Release (ESR) branch in May 2023, which initially promised 15 months of security updates after Microsoft's cessation of support for these operating systems. The ESR release calendar now indicates that support for Firefox 115 ESR will continue for Windows 7 and 8.1, as well as macOS versions 10.12 to 10.14. Mozilla will re-evaluate this decision in August 2025. While security updates will continue for the ESR releases, new features will only be available on currently supported operating systems. Users are encouraged to consider upgrading to Windows 11 for enhanced security and functionality.