network.protocol-handler.warn-external.ftp
If I understand correctly, you want FTP links from other programs (e.g.
Thunderbird) to open in Firefox. That is a Windows setting you need to
change via the Windows Control Panel.
--
Chris Ilias <http://ilias.ca>
Mailing list/Newsgroup moderator
In the dialog open with of thunderbird was listed Firefox and chose it,
ie open insteand of firefox.
I delete mimetype.rdf and go accross the same, instead of choosing
firefox listed i specified the full path to fx4.0 and now the ftp links
open fine.