Tabs don't work in Firefox

At the top of the comments are different “tabs” for “Comments” “Pingbacks” etc.
Sadly nothing happens when you click on them with Firefox. With the Internet Explorer it works as expected.
Is there a fix for this?
My example page: http://www.peleke.de/allgemein/uebersicht-ueber-mitfahrmoeglichkeiten-alternativen-zu-mitfahrgelegenheit-de/
Thanks for help!

http://wordpress.org/extend/plugins/social/