Is Facebook trying to scan my Fritzbox ?

Hi there

got an strange message while browsing with

- Firefox 22.0a2 (2013-04-17)
- Noscript 2.6.6
- Fritzbox Addon 1.7.0

I had my Fritzbox opened in a tab and a facebook-Page.

Suddenly this message appeared http://smithsonian1974.net/Files/ABE_FbFB.jpg

What does this message mean ?
It seems like Facebook is trying to scan my fritzbox. Message always comes when refreshing the facebook-tab.

greets

Smithsonian1974