@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document domain("google.co.jp"), domain("google.com") {
    a[href^="https://profiles.google.com"],
    a[href^="https://accounts.google.com"] {
        opacity: 0;
    }
    a[href^="https://profiles.google.com"]:hover,
    a[href^="https://accounts.google.com"]:hover {
        opacity: 1;
    }
}