As of early May 2026, there are two primary ESR branches maintained by Mozilla to support different hardware and operating system tiers:
You can find official installers for all operating systems and in over 90 languages through Mozilla's centralized distribution points: Firefox ESR Release Notes firefox esr download all
: The current mainstream branch for modern systems. It includes features introduced through version 140 and is the recommended download for Windows 10/11, modern macOS, and Linux. As of early May 2026, there are two