Here we go, just insert this into your <head> tag:
Code:
<script language="JavaScript1.2">
<!--
/*
Auto Maximize Window Script- By Nick Lowe (nicklowe@ukonline.co.uk)
For full source code, 100's more free DHTML scripts, and Terms Of Use
Visit http://www.dynamicdrive.com
*/
top.window.moveTo(0,0);
if (document.all) {
top.window.resizeTo(screen.availWidth,screen.availHeight);
}
else if (document.layers||document.getElementById) {
if (top.window.outerHeight<screen.availHeight||top.window.outerWidth<screen.availWidth){
top.window.outerHeight = screen.availHeight;
top.window.outerWidth = screen.availWidth;
}
}
//-->
</script>
And it should work.
However not for me, I have an option in Firefox which forbids and script to move, resize or close my windows. 
cr3ative
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