Examine source code of Radiance

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "#339999",
      "tab_background_text": "#336666"
    }
  },
  "version": "2.0",
  "name": "Radiance",
  "manifest_version": 2,
  "description": "A simple, minimalistic radiant look for firefox."
}