Firefox ESR 115

Firefox ESR 115 reaches end of life in March 2027, when security updates stop.

Status: Security fixes only
Released: July 4, 2023
Security updates until: March 2027
Long-term support release: Yes
Official lifecycle page: whattrainisitnow.com
Checked on: September 29, 2026

Firefox ESR 115 gets security fixes only. Security updates continue until March 2027. Mozilla released it on July 4, 2023. Mozilla keeps ESR 115 only for Windows 7 to 8.1 and macOS 10.12 to 10.14, the systems newer Firefox versions no longer support.

Product: Firefox ESR
Version: 115 (Windows 7-8.1, macOS 10.12-10.14 only)
Sources: Page URL
Mozilla release calendar https://whattrainisitnow.com/release/?version=esr

Page	URL
Mozilla release calendar	https://whattrainisitnow.com/release/?version=esr

Questions

When does Firefox ESR 115 reach end of life?

Security updates for Firefox ESR 115 continue until March 2027.

Is Firefox ESR 115 still supported?

Only with security fixes. Firefox ESR 115 gets security updates until March 2027.

When was Firefox ESR 115 released?

Firefox ESR 115 was released on July 4, 2023.

Where do the Firefox ESR 115 dates come from?

From the vendor’s official pages (Mozilla release calendar), checked on September 29, 2026.

Sources

Every date comes from the vendor’s official lifecycle or release page: Microsoft Lifecycle and Windows release health, Ubuntu’s release cycle, Debian releases, the Python developer guide, the Node.js release schedule, php.net, Oracle’s Java SE support roadmap and Lifetime Support Policy, the .NET support policy, PostgreSQL versioning, Mozilla’s release calendar and Google’s Pixel update policy. Each record links its sources and shows the date they were checked.