Stylish extension for firefox issues

talk random
1

https://addons.mozilla.org/firefox/2108/ < if you don’t know what stylish is

I applied a small mod to the stylesheet of this forum- I just changed the bg image but when I navigate to another page- or refresh the page I apply it to- it unapplies itself. Any idea as to what I may be doing wrong?

I was using this

@namespace url(http://www.w3.org/1999/xhtml);

@-moz-document domain("kirupa.com") 
{body
{
    background: #333333 url(http://darkmotion.com/forum/enlighten/misc/bg.gif);
    color: #000000;
    font: 10pt arial, verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif;
    margin: 5px 5px 10px 5px;
}

}