Version 52.9. 0 Esr Download [top] — Firefox

If you have a machine running or Windows Vista , mainstream browsers no longer function. Google Chrome dropped XP in 2016, and modern Firefox (version 115+ is the last for Windows 7/8, not XP). Firefox 52.9.0 ESR is likely the most secure, modern browser that can physically run on these antique OSes. It allows you to:

If you're looking for a stable, supported version of Firefox for enterprise or personal use, consider downloading the latest Firefox ESR version directly from Mozilla's official website. Mozilla provides the latest ESR versions which include security updates and features that are supported for a longer period.

If you install Firefox 52.9.0 ESR on a machine connected to the internet, it will immediately try to update itself to a newer, incompatible version. You must disable automatic updates instantly. Disable Automatic Updates

Select your preferred language code folder (e.g., en-US for English - United States). Download the .exe , .dmg , or .tar.bz2 installer file. Technical Specifications & System Compatibility firefox version 52.9. 0 esr download

If you still need to proceed, follow these steps to obtain the legitimate, unaltered installer:

Keeping an old Windows XP machine functional for specialized tasks.

Last updated: October 2025

Warning: Firefox 52.9.0 ESR is an old, unsupported release with known security vulnerabilities. Use it only if you must for legacy compatibility and only on isolated systems.

Enter the folder for your language (e.g., en-US/ for English).

: You cannot sign in to official Mozilla Accounts or use Firefox Sync services natively on this version due to elevated authentication protocols on modern servers. ⚙️ Post-Installation Optimization Tips If you have a machine running or Windows

Firefox 57 (released November 2017) introduced "WebExtensions" and killed support for legacy XUL/XPCOM add-ons. However, until version 52.9.0. This is critical for users relying on older, powerful add-ons like:

To ensure security and file integrity, always download from official Mozilla repositories :

: Necessary for interactive archives and legacy training modules. It allows you to: If you're looking for

Features early implementations of Mozilla's multi-process architecture to separate web content from the main browser UI process.

Last checksum verification: Refer to https://archive.mozilla.org/pub/firefox/releases/52.9.0esr/SHA256SUMS