[jQuery] jquery sifr plugin works not in Firefox 2.0

[heohni]

I have set a website up using the jquery sifr plugin. In all new
browsers(IE7,8, FF3, Opera and Safari 3,4)  is works fine!
Even in IE6 - where the plugin doesn't work, it's simple not
recognized and the normal text is shown.

Only in FF2, no text at all is shown.
Here is my code:

<h2>headline</h2>
$('h2').sifr({
                path: '/' ,
                color: '#C3FF4F',
                save: true,
                font: 'euphemia'
        });

Is there any trick to get it working in FF2?

On request I can post you the link on the web to check.

Thanks!