I'm using TB 3.0.1 and have enabled the "Bcc these email addresses"
option for my own address. When I write/compose a new message, the
Bcc: address automatically shows up at the very top of the window. The
next field is the To: field.

Is there any way via userChrome.css or any add-on to hide this "Bcc:"
field from getting displayed in the message write/compose window?.
Since I know that I'm doing Bcc: to myself, seeing this entry it is
not necessary. Thanks