Mozilla’s official FTP/archive historically hosted old builds, but official support for very old versions may be removed or relocated. Use these guidelines:
For professionals who must legally obtain this software, the safest path is: download old version of mozilla firefox 3.6
Even after doing this, many sites will display broken or "your browser is not supported." Report: Downloading Old Version of Mozilla Firefox 3
also host these files, though official servers are preferred for integrity. Critical Safety Considerations Using a browser from 2010 in 2026 presents major hazards: Download Mozilla Firefox 3.6 - OldVersion.com Official Website: http://www.mozilla.com/firefox. OldVersion download old version of mozilla firefox 3.6