header transparent in FF

I have tried everything I can think of to get the white background behind my header image to go away. I originally didn’t make a child theme, but now I have one. I’ll reload the old twenty twelve later.

I have tried using Firebug, but stupidly I cannot figure out what the white is? I have tried this:

#header {background-color:transparent;}
#page-wrap {background-color:transparent;}
#masthead.site-header {background-color:transparent;)
#content, .single {background-color: #fff;}
#main.wrapper {background-color:transparent;}

The site URL is: HERE