次の個所が問題かもしれない。( ttps://bugzilla.mozilla.org/show_bug.cgi?id=451155#c1 ) "The storage-Legacy.js module probably needs to use nsIScriptableUnicodeConverter (as it already does in _encrypt()/_decrypt() for usernames and passwords) for every string that might be written to disk. This would mean hostname, formSubmitURL, httpRealm, and usernameField/passwordField. Oh, and the disabled-hosts list too."