Ok, first, everyone stop saying it might be the fuel pump cut off, its not the freakin' fuel pump cut off, that is behind the passenger side kick panel 4 feet away from where this thing was found.
I went and pulled up the component location charts from Ford and there are two things on it that look like they could be it. If its on the passenger side of the radio hole then it isn't labeled.
If its on the driver's side it looks like it could be a few things depending on the vehicle's options, namely the battery saver relay, assuming its a 2wd and has no power options.
End conclusion: Take it out, find out what doesn't work, and let us know so we can finally know. The suspense is killing me dude!!!