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URL: https://www.firefox.com/en-US/firefox/140.12.0/releasenotes/

⇱ Firefox ESR 140.12.0, See All New Features, Updates and Fixes

140.12.0 Firefox ESR

June 16, 2026

Version 140.12.0, first offered to ESR channel users on June 16, 2026

Firefox 140 Extended Support Release (ESR) includes all of the enhancements since Firefox 128, along with many new features to make your enterprise deployments easier and even more flexible.

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Firefox is no longer supported on Windows 8.1 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox is no longer supported on macOS 10.14 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

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