Circa five years ago the browsers dropped FTP support.
#curl still supports it. In 2024, 23% of curl users said they used FTP within the past two years.
My post from April 2020:
https://daniel.haxx.se/blog/2020/04/15/curl-is-not-removing-ftp/

curl is not removing FTP
FTP is going out of style. The Chrome team has previously announced that they are deprecating and removing support for FTP. Mozilla also announced their plan for the deprecation of FTP in Firefox. Both browsers have paused or conditioned their efforts to not take the final steps during the Covid-19 outbreak, but they will continue … Continue reading curl is not removing FTP →