Firefox ESR 140.3.1 released

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Donal Meehan

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Sep 23, 2025, 10:23:25 AM (8 days ago) Sep 23
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We are pleased to announce that the Firefox ESR 140.3.1 release is now
available for download at https://www.mozilla.org/firefox/organizations/all/.

Release notes for Firefox 140.3.1esr are available at
https://www.firefox.com/firefox/140.3.1/releasenotes/.

As always, we recommend that users keep up to date with the newest version of
Firefox ESR for the latest stability and security fixes.

Thank you,
Donal Meehan,
Firefox Release Manager
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