Firefox is the last browser to remove FTP support pretty much killing widespread use of this rather insecure protocol.
This is bittersweet as I got my start on the Internet using FTP and Gopher to download data for economic analysis in the early 1990s. But the Internet was much different then and I applaud the push for encryption everywhere. With tools like Let’s Encrypt there is really no reason to have any uncrypted traffic on the Internet.