Nundina › Discover calendars › Version End-of-Life Dates calendar › Firefox 140 (ESR) end of lifeFirefox 140 (ESR) end of life29 September 2026Firefox 140 (ESR) stops receiving security updates. Released 24 Jun 2025. This is a long-term-support release. Latest version 140.17.0 (29 Sep 2026). Source: endoflife.date.Version End-of-Life Dates calendarMore from this calendar

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