Firefox - New Password disclosure vulnerability
This new vulnerability could be exploited during a phishing attack, however there are no reports so far of this being in-the-wild.
QUOTE: The vulnerability is caused due to the Password Manager not properly checking the URL before automatically filling in saved user credentials into forms. This may be exploited to steal user credentials via malicious forms in the same domain.
WORKAROUND: Disable the "Remember passwords for sites" option in the preferences.