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Always download directly from archive.mozilla.org . Never trust third-party "old version" websites, as they are notorious for bundling malware.

To prevent the browser from immediately updating itself back to the latest version:

Mozilla organizes these by operating system and language. After clicking a link below, select your language folder (e.g., en-US for English - United States) to find the installer: (The final update for the 52 ESR series) Windows 32-bit Windows 64-bit Linux 64-bit Firefox 12.0 (Legacy version from 2012)

Disclaimer: Mozilla, Firefox, and the Firefox logo are trademarks of the Mozilla Foundation. This article is for educational and archival purposes only.