The problem here is the mime type mismatch, as indicated in the console output of both Internet Explorer and Google Chrome. Looks like firefox just resolved this slide. It probably shouldn't be.
Consider the following code:
<script type="text/javascript" src="...indeed.nl/jobroll?q=tmap&l=&limit=10"></script>
This expects the jobroll resource to be a JavaScript resource (this is it if you check the response body). But the problem is that .nl really does send JavaScript, claiming it is HTML. A quick look at the response headers will show this:

, text/javascript, text/html. , Internet Explorer Chrome .
, , script, . , , .