Examine source code of Headup Shine

{
  "theme": {
    "images": {
      "theme_frame": "header01.jpg"
    },
    "colors": {
      "frame": "#1c1c1c",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Headup Shine",
  "manifest_version": 2,
  "description": "Headup is the Firefox addon that helps you\ndiscover content related to your\ninterests and your friends... www.headup.com"
}