Download Mozilla Firefox Old: Version

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.

Search for "Firefox" and your target version. download mozilla firefox old version

Find your desired version number (e.g., 115.0 , 91.0 , 52.0 ). Click on it. Download the installer and verify the file hash if provided

Go to the official directory: https://ftp.mozilla.org/pub/firefox/releases/ use ESR. While not "ancient

Go to a trusted old-software repository.