Firefox ESR 140.12 released

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Ryan VanderMeulen

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Jun 16, 2026, 10:49:02 AMJun 16
to Mozilla.org
We are pleased to announce that the Firefox ESR 140.12 release is now available for download at https://www.firefox.com/download/all/desktop-esr/.

Release notes for Firefox 140.12.0esr are available at
https://www.firefox.com/firefox/140.12.0/releasenotes/.
Associated security advisories are posted at:
https://www.mozilla.org/security/advisories/mfsa2026-58/

Firefox ESR 115.37.0 is also now available for Windows 7-8.1 and macOS 10.12-10.14 users per the previously-announced window of extended security support for that release.

Release notes for Firefox 115.37.0esr are available at
https://www.firefox.com/firefox/115.37.0/releasenotes/.
Associated security advisories are posted at:
https://www.mozilla.org/security/advisories/mfsa2026-59/

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,
Ryan VanderMeulen
Firefox Release Manager

Andrei Boros

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Jun 16, 2026, 4:41:06 PMJun 16
to enter...@mozilla.org
Hi,

I have trouble updating ESR-115.36 to 115.37.
Shows update available. Starts to download showing 0 bytes of 8.2M then stalls.
Then shows just 0 bytes.
Then after several minutes it says update failed.

Multiple instances of installed FF-ESR-115.36 and portable instances of same version, on multiple computers, coming from multiple networks.

Thank you.
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ing. Andrei Boros

Serviciul IT&C
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Mike Kaply

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Jun 17, 2026, 12:10:33 PM (14 days ago) Jun 17
to Andrei Boros, enter...@mozilla.org
We were able to do updates. Is it possible you are having network issues?

Mike

Andrei Boros

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Jun 18, 2026, 5:53:13 AM (13 days ago) Jun 18
to Mike Kaply, enter...@mozilla.org
Today it seems to work, at least from one set of computers and network.

Andrei Boros

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Jun 20, 2026, 1:49:01 PM (10 days ago) Jun 20
to enter...@mozilla.org
And today it seems to perform the update much more promptly and faster.

On the 16th-17th we had rare and intermittent problems with some areas of the internet and on the 17th in the evening we had over an hour of outage with anything Google related, traced to several routing problems at Tier 1 exchanges, affecting multiple ISPs in Romania. Don't know it there is any relation.
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