Overview: What Firefox ESR Is

Firefox ESR (Extended Support Release) is a version of Mozilla Firefox built from an official Firefox release but maintained on a slower update cadence. Instead of receiving every rapid-feature update, ESR gets periodic point releases that focus on security and stability, often aligned with the security fixes rolled into the mainstream Firefox channel.

Key advantages

  • Greater compatibility and fewer unexpected breakages for enterprise environments.
  • Security patches and critical fixes delivered in point releases that mirror the regular Firefox updates.
  • Fewer UI changes and feature experiments, which reduces surprises for end users.

Who benefits most

  • Organizations and schools that manage many workstations and need predictable behavior.
  • IT teams that want to minimize maintenance overhead and avoid frequent browser-driven disruptions.
  • Any environment where long-term stability and application compatibility are more important than the latest features.

Alternatives to consider

  • Microsoft Edge (Chromium-based) — enterprise features and centralized management tools.
  • Google Chrome — broad web compatibility and frequent security updates.
  • Mozilla Firefox (standard release) — if you prefer the latest interface and features and accept faster update cycles.

Technical

Title
Firefox ESR
Requirements
  • Windows
  • Mac
Language
English
Available languages
  • Arabic
  • Chinese (Simplified)
  • Czech
  • Danish
  • German
  • Greek
  • English
  • Spanish
  • Finnish
  • French
  • Italian
  • Japanese
  • Korean
  • Dutch
  • Norwegian
  • Polish
  • Portuguese
  • Russian
  • Swedish
  • Turkish
License
  • Free
Latest update
2025-07-08
Author
Mozilla

Firefox ESR for other platforms

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