there, for some reason Ultimate facebook elements do not

Hi there,
for some reason Ultimate facebook elements do not display in Firefox. It all works fine in Safari and Chrome - even IE.
Here is the blog-link:
http://www.anton-lennartz.com/tonys-blog/
It should show the FB-Connect widget and the stream.

And this is a link to a single post with like / share and FB comments at the bottom of the post:
http://www.anton-lennartz.com/bushcrafter-und-plastikflaschen/

Any idea?