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For me it does not work. I can access most FTP server, but I have one, really important, where FireFTP fails.

User name contains "@" character and I cannot change it. Maybe that's the reason. Maybe it's because I use Win 7 64bit... I don't know. Anyway, it does not work for me. I can't connect to this server at all.

Questa recensione riguarda una versione precedente (1.99.2.1-signed) del componente aggiuntivo. 

Try the latest version, 1.99.3 it might solve your issue:
https://addons.mozilla.org/en-US/firefox/addon/fireftp/versions/