Mozilla Firefox Esr 91 Work Download May 2026

This means it no longer receives security updates from Mozilla 1.4.1, 1.4.8. Support Ended: September 20, 2022 1.4.1.

As of May 2026, Firefox ESR 91 is a and is no longer available on the main download page. You can still access installers for various operating systems through the Mozilla FTP Archive 1.2.1. mozilla firefox esr 91 download

Before downloading, ensure your hardware meets the minimum specifications 1.5.1 , 1.5.7 : Windows 7, 8, 10, or 11 (32-bit or 64-bit) 1.5.7. macOS: macOS 10.12 Sierra or higher 1.5.11 . This means it no longer receives security updates

91.13.0esr (released August 23, 2022) 1.4.1. You can still access installers for various operating

Most users should upgrade to the latest Firefox ESR (currently based on version 128 or newer as of mid-2026) to ensure modern web compatibility and security 1.4.1, 1.5.8 . 💻 System Requirements

Only download from Mozilla.org or their FTP servers to avoid security risks from third-party sites 1.2.1, 1.3.3 . ⚙️ Why Use Firefox ESR 91?