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Find your desired version number (e.g., 115.0 , 91.0 , 52.0 ). Click on it.
Go to the official directory: https://ftp.mozilla.org/pub/firefox/releases/
Download the installer and verify the file hash if provided. Method 3: Firefox Extended Support Release (For Enterprise) If you need a "stable old version" that still gets security patches, use ESR. While not "ancient," ESR is ~1 year behind the main release.
Go to a trusted old-software repository.