Adsense in FireFox not showing

I came accross something very strange when i was testing my pages in FireFox. The Adsense blocks are commented out (green) in firefox.

It does render however properly when i paste all the rendered code in a b开发者_开发技巧lank aspx page in the same project without using masterpage.

http://picpaste.com/problem.jpg

Here's a picture of the problem. As you can see on one of the pages the script code is green. How is that possible?

The version that doesn't work correctly is defined as XHTML. This means that <!-- will always open a comment, even inside a script tag.

You can remove the comment tag as it isn't needed, and you should put the contents of the script tag in a CDATA block:

<script type="text/javascript">
<![CDATA[
// script goes here
]]>
</script> 

Solved. the page was sent as application/xhtml+xml which has to be text/html. Although not defined as such it did send it with that content-type.

Any solutions on how to get AdSense work on firefox with content-type application/xhtml+xml?