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Hello, I have a problem with FireFTP 2.0.20. During the update, the message is that the version is not compatible with Firefox 31.
Update 16/08/14. Thanks for the info. Now I do know.

Questa recensione riguarda una versione precedente (2.0.20.1-signed) del componente aggiuntivo. 

This is a known issue and problem with Firefox's website:
https://bugzilla.mozilla.org/show_bug.cgi?id=1052065

You'll have to go currently to this page to get a version that works for 31:
https://addons.mozilla.org/en-US/firefox/addon/fireftp/versions/