Locating an item in code?

Hi there,

I’m fairly new to wordpress and I have recently been appointed to maintain a wordpress site. I want to edit some text inside the featured client box seen here:

http://tintedadvertisinggraphics.com/colored-films/

I thought it would be part of a sidebar widget but sadly it’s not. So I was wondering how can I locate it through the code? I downloaded that firebug app from firefox but I don’t really know what to look for. Is there a simpler way of doing it?

Any help would be greatly appreciated Thanks 🙂