Firefox completly diffrent

Hey Everyone,

I have a problem with my website.
In IE it's all working fine, but in Firefox it is really a mess. So mebye i have made a mistake in my CSS.
I hope anyone can help?

Thanks,
Tim

A piece of my CSS --

/* Generic elements */

body {
background:#444444;
margin:0;
padding:0;
font: 12px/170% Verdana;
color: #333333;
}

body.mceContentBody {
background: #FFFFFF;
}

a:link, a:visited, a.hover, a.active, {
color: #333333;
text-decoration: none;
}

#container-full {
width: 794px;
margin-left: auto;
margin-right: auto;
background:#FFFFFF;
}

#header-full {
margin-top: 0px;
}

#header {
/* de header zelf GEEN DATA */
}

#primary-links, {
font-weight:bold;
font-size:10px;
position:absolute;
margin-top: 172px;
margin-left: 50px;
}

ul.primary-links li a, ul.primary-links li a:link, ul.primary-links li a:visited, ul.primary-links li a:hover, ul.primary-links li a.active {
color: #FFFFFF;
}

#secondary-links, {
font-weight:bold;
font-size:11px;
text-align:center;
}

#frontpage-top-left {
width: 342px;
text-align:left;
float:left;
background-color:#e8e8e8;
margin-left: 29px;
padding: 0px;
}

#frontpage-top-right {
width: 346px;
text-align:left;
margin-left:25px;
float:left;
background-color:#e8e8e8;
}

#text-block {
padding-left:0px;
padding-right:0px;
}

/* BASIC */
#content-full {
width: 786px;
margin-left: auto;
margin-right: auto;
margin-top: 10px;
}

#tabs {
font: 12px/170% Verdana;
width:780px;
text-align:left;
clear:both;
padding-top:10px;
}

#message { /* alerts to the user */
font: 12px/170% Verdana;
width:780px;
text-align:left;
background-color: #E9FB04;
border: 0px solid #ccc;
padding:0px;
clear:both;
}

#help { /* administration help */
font: 12px/170% Verdana;
width:780px;
text-align:left;
border: 0px solid #ccc;
padding: 0px;
}

#main {
text-align:left;
}

#footer-full {
width: 794px;
margin-left: auto;
margin-right: auto;
margin-top: 10px;
}