I've completed a theme by myself and it works fine. But after some time I noticed that there is a firebug-script running which I did not put there and which is messing with a widget I use.
Is hiding in my header, but I cannot see where it does come from so I can get rid of it. The plugins I have are:
Google Analytics for WordPress by Yoast version 4.2.2
Image widget by Modern Tribe, inc version 3.3.2
Simple Tags by Amaury BALMER version 2.2
Wordpress MU Domain Mapping by Donncha O Caoimh version 0.5.4.2
Wordpress SEO by Yoast version 1.1.5
Does have anybody the same problem with one of these plugins? Or is there somebody who is definitely smarter than my and can figure out what is wrong? The actual website can be found here
Thanks a lot!