Firefox 140 end of life (EOL) date and support status
End of life End of life since 2026-09-29 (9 days ago)
Upgrade: Firefox 140 no longer receives fixes. Supported cycles: 157, 153, 115.
| Product | Firefox |
|---|---|
| Version cycle | 140 |
| Status | End of life |
| Released | 2025-06-24 |
| LTS | yes |
| Active support until | — |
| End of life | 2026-09-29 |
| Latest version | 140.17.0 (2026-09-29) |
| Last verified | 2026-10-08 |
All Firefox versions → · Source: endoflife.date
Frequently asked questions
Is Firefox 140 end of life?
Yes. End of life since 2026-09-29 (9 days ago). It no longer receives security or bug fixes.
When does Firefox 140 reach end of life?
Firefox 140 reached end of life on 2026-09-29.
When was Firefox 140 released?
Firefox 140 was first released on 2025-06-24.
What is the latest Firefox 140 version?
The latest 140 release is 140.17.0, published on 2026-09-29.
Is Firefox 140 an LTS release?
Yes.
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