Nundina › Discover calendars › Version End-of-Life Dates calendar › Firefox 156 end of lifeFirefox 156 end of life29 September 2026Firefox 156 stops receiving security updates. Released 15 Sep 2026. Latest version 156.0.1 (22 Sep 2026). Source: endoflife.date.Version End-of-Life Dates calendarMore from this calendar