Problem with Java-Script in firefox

Our problem: we have some moduls for ads with java script.

In Chrome and IE all modules with Java are displayed correct.

In firefox only the modules are displayed, which you can see, if the page is loaded. all other modules, where you have to scroll down are white.

please have a look at: http://90minuten.at/90minuten2013/

thx.

I've check your site on Firefox (scroll to bottom) and see it exacly the same like on Chrome browser, please look :

- firefox http://d.pr/i/sToi
- chrome http://d.pr/i/LPst