/* Write in Secrecy (for basic and older webmail) */
@namespace url(http://www.w3.org/1999/xhtml);

   /* GMail (old compose) */
@-moz-document domain("mail.google.com")
{
.dK.nr:not(:hover),
.ez.nr:not(:hover),
.editable.LW-avf:not(:hover)
{
color: transparent !important;
}
}

   /* Hotmail (old Live mail) */
@-moz-document domain("mail.live.com")
{
.InputUL:not(:hover),
#fSubject:not(:hover),
.RichText:not(:hover)
{
opacity: 0 !important;
}
}

   /* AOL Mail (Basic) */
@-moz-document domain("mail.aol.com")
{
#To:not(:hover),
#Subject:not(:hover),
#RichBody:not(:hover)
{
color: transparent !important;
}
}

   /* Yahoo! Mail (Classic) */
@-moz-document domain("mail.yahoo.com")
{
#to,
#cc,
#bcc,
#Subj,
#compose_editorArea
{
color: transparent !important
}
}