Examine source code of Eggshell White

{
  "theme": {
    "images": {
      "theme_frame": "head2.JPG"
    },
    "colors": {
      "frame": "#ffffcc",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Eggshell White",
  "manifest_version": 2,
  "description": "Just a eggshell white version of firefox..."
}