Nundina › Discover calendars › Version End-of-Life Dates calendar › Firefox 154 end of lifeFirefox 154 end of life1 September 2026Firefox 154 stops receiving security updates. Released 18 Aug 2026. Latest version 154.0.1 (25 Aug 2026). Source: endoflife.date.Version End-of-Life Dates calendarMore from this calendar