Examine source code of cb-firefox

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#d8d8d8",
      "tab_background_text": "#d8d8d8"
    }
  },
  "version": "2.0",
  "name": "cb-firefox",
  "manifest_version": 2,
  "description": "a simple CrunchBang-based theme"
}