Firefox ESR 153

Firefox ESR 153 is the current Firefox ESR; Mozilla has not yet published its end of life date.

Status: Supported
Released: July 21, 2026
Long-term support release: Yes
Official lifecycle page: whattrainisitnow.com
Checked on: September 29, 2026

Firefox ESR 153 is the current Firefox Extended Support Release. Mozilla released it on July 21, 2026 and has not yet published the date its support ends. After October 13, 2026, when ESR 140 stops getting updates, ESR 153 is the only main ESR branch. ESR 115 continues separately for Windows 7 to 8.1 and older macOS versions.

Product: Firefox ESR
Version: 153
Sources: Page URL
Mozilla release calendar https://whattrainisitnow.com/release/?version=153

Page	URL
Mozilla release calendar	https://whattrainisitnow.com/release/?version=153

Questions

When does Firefox ESR 153 reach end of life?

Mozilla has not yet published the date. Firefox ESR 153 was released on July 21, 2026 and is the current Firefox Extended Support Release.

Is Firefox ESR 153 still supported?

Yes. After October 13, 2026, when ESR 140 stops getting updates, ESR 153 is the only main ESR branch.

When was Firefox ESR 153 released?

Firefox ESR 153 was released on July 21, 2026.

Where do the Firefox ESR 153 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.