hint.css does not work well with prettify.js on Firefox

I am using hint.css in combination with prettify http://code.google.com/p/google-code-prettify/

On Chrome/Safari the tooltips look normal, on Firefox, the combination with prettify.js yields strange results - the arrow is mangled or does not appear and the second/third letter of the tooltip are only semi-visible.


toy example code:

``` html

        

 <?xml version="1.0" encoding="utf-8" ?>

 <book>

    <page>1</page>

    <page>2</page>

    <page>3</page> 

</book>

        

    

```