In IE it looks as if you wanted the red line to traverse the site and this is not being displayed in FF in the same location. It does not appear to be an image and do you want it to be visible and inline with the one in your logo? Or as it displays if FF as a topper for the pink separator bar? Or having the logo underline lined up with the other red line?
If it is what I think you want. you can try this adding/forcing a height to:
Code:
#headerWrapper {
background-color: #ffffff;
margin: 0em;
padding: 0em;
height: 67px;
border-bottom: 1px solid #cc0066;
}
But I actually think that if you moved this line out of the css and into a header back ground image that repeats that you will have better luck.