Examine source code of Screamers

{
  "theme": {
    "images": {
      "theme_frame": "Header2.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#2e2d2d"
    }
  },
  "version": "2.0",
  "name": "Screamers",
  "manifest_version": 2,
  "description": "Looks best with google toolbar..."
}