Because this archive acts as a file directory rather than a standard webpage, finding the right file requires following a specific folder path: mozilla.org Directory Listing: /pub/firefox/releases/ - mozilla.org Directory Listing: /pub/firefox/releases/ Stack Exchange
For users seeking to download Firefox via FTP, it is important to note that while Mozilla maintains a vast archive of releases, modern web browsers, including Firefox itself, for direct browsing as of 2021 . However, the data remains accessible through an HTTP-based mirror of the original directory structure. Where to Find the Official Firefox Archive
https://ftp.mozilla.org/pub/firefox/releases/