Firefox 140 (ESR) end of life
10dage
—hype
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About this moment
There are 11 days until Firefox 140 (ESR) end of life, on Tuesday, 29 September 2026.
Firefox 140 (ESR) reaches end of life on September 29, 2026: upstream support ends and no further security fixes are expected. It was released on June 24, 2025.
- Where
- Worldwide
Date source
Last verified Sep 18, 2026
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