Firefox 12-51 52 Esr Download Apr 2026

In the rapid evolution of web browsers, few names carry as much weight as Mozilla Firefox. While most users are on the rapid-release cycle (version 120+ as of 2024), there is a dedicated niche of developers, enterprise IT managers, and retro-computing enthusiasts searching for older builds. Specifically, queries for Firefox versions 12 through 51 , including the long-supported Firefox 52 ESR (Extended Support Release) , remain surprisingly common.

https://archive.mozilla.org/pub/firefox/releases/ Disclaimer: This article is for educational and archival purposes. The author assumes no responsibility for data loss or security breaches caused by running outdated software. firefox 12-51 52 esr download