I think this is a bad idea - many URLs are encoded as ftp still, e.g. when downloading tarballs, zips and such - does this mean clicking on an FTP URL now will require launching an external ftp app instead of downloading the file? I'm ok if FTP browsing is suspended through the browser, but abandoning FTP altogether in the browser is a bad idea. It's an old protocol and still very useful, albeit not in its unencrypted state maybe, but it does do a good job of what it's supposed to - namely, transfer files.