Firefox doesn't load the Wufoo Webfont

Hello,

I’m using a custom css file for my Wufoo Templates with integrated Webfonts (placed on a webserver).

The webserver is equipped with a ssl certificate and Chrome, iE 8 & 9 and Safari are loading the page with the included webfonts correctly – except Firefox. There are no warnings or failures in the console.

Thanks.

https://www.ads-software.com/extend/plugins/wufoo-shortcode/