Nundina › Discover calendars › Version End-of-Life Dates calendar › Firefox 158 end of lifeFirefox 158 end of life27 October 2026Firefox 158 stops receiving security updates. Released 13 Oct 2026. Latest version 158.0.1 (20 Oct 2026). Source: endoflife.date.Version End-of-Life Dates calendarMore from this calendar