Stylesheet not applying in Firefox, but works in Chrome/IE?

Okay, so I'm working on a fairly simple site for a client, and I use the code:

<link href="http://ads.jakelee.co.uk/images/default.css" rel="stylesheet" media="screen" type="text/css">开发者_开发百科; 

To reference a stylesheet. Now, this works as expected in Chrome 9, and IE6-8. However, in firefox, no stylesheet appears.

The site itself is here.

My question is, how can I make sure the stylesheet applies in firefox too? For reference, I'm using Firefox v3.5.16, released 9th Dec 2010.

Thanks for your help!

Have you got the AdBlock Plus extension installed? I'm subscribed to the EasyList set of filters, and this rule blocks your stylesheet:

|http://ads.$domain=~ads.su|~ahds.ac.uk

Either remove the rule, or disable ABP on your domain.