Version 52.9. 0 Esr !free! Download — Firefox

While outdated now, at its release, 52.9.0 included all security fixes from the preceding 15 months, including patches for critical zero-day vulnerabilities.

: It is the last official release for Windows XP (SP2 or higher) and Windows Vista . firefox version 52.9. 0 esr download

Leave a comment below (if on a modern browser!) or consult your IT department before proceeding. Remember: security is not a feature—it is a necessity. While outdated now, at its release, 52

: It is the absolute last version of Firefox to run on Windows XP and Windows Vista . While outdated now

: It was the final release to support XUL-based legacy extensions before Firefox transitioned fully to the WebExtensions API.