Examine source code of Firefox Broken Glass

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#ccc200",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Firefox  Broken Glass",
  "manifest_version": 2,
  "description": "This theme is an image of broken glass with explorer and Firefox appearing through from the cracked opening in the glass."
}