I'm trying to find out how to FTP anonymously through proxy.

I have TOR, Privoxy, with Firefox.

I tried to access the FTP by typing the url in the browser but, I don't know if it's since ToR is so slow that it couldn't connect.

I've heard of people using FileZilla also recommended on ToR's wiki but, I've read that Privoxy doesn't support FTP so if I have to type in the domain name to FTP then there will be DNS leaks. Is there anyway I can find out what the IP is to the domain I'm trying to connect to, without having to ask the admin?

If I do a whois search on the domain and the IP get, can I use that?

I have also found online web-based ftp tools. If I use one of them through firefox with tor and privoxy will my traffic be anonymized?