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Re:Mozilla will remove FTP support in Firefox by tyingq on Friday March 20, 2020 @05:48PM (#22641987)
Plaintext passwords over the net. Also, it's somewhat painful for NAT because it opens up a second port that isn't a named one, the client sends that port number to the server, then the server opens a connection to the client.
Re:Mozilla will remove FTP support in Firefox by duskwuff on Friday March 20, 2020 @05:53PM (#22642031)
That's for active FTP, which basically nobody uses anymore (since it's incompatible with most firewalls).

Most clients use the passive FTP extension, in which the server sends the client a host/port pair to connect to for the data connection. Still painful, but slightly less so.