Download Firefox 12-51 52: Esr 2021

If you install Firefox 52 ESR, you must immediately disable automatic updates. Otherwise, it will auto-upgrade to Firefox 60 ESR (which drops NPAPI support and will break your legacy plugins).

Once inside a version folder, you must choose the correct installer for your computer:

You should only download older versions of Firefox from reputable, official sources to avoid malware. 1. The Official Mozilla FTP Archive Download Firefox 12-51 52 Esr

Mozilla moved to a faster update schedule during this era.

The is designed for organizations that manage their own client deployments. Firefox 52 ESR is considered the "golden version" for legacy systems. If you install Firefox 52 ESR, you must

By default, Firefox attempts to update itself to the newest version immediately upon installation.

Scroll to find the specific version number you need (e.g., 52.9.0esr or 45.0 ). Firefox 52 ESR is considered the "golden version"

because they do not contain modern patches for web vulnerabilities. Mozilla Support Disable Auto-Updates: After installing, immediately go to Options/Preferences > General > Firefox Updates and set it to "Check for updates but let you choose to install them" "Never check for updates" to prevent it from jumping to a modern version. Separate Profiles: dedicated profile

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