Examine source code of Epic Adventure

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#f0f0f0"
    }
  },
  "version": "2.0",
  "name": "Epic Adventure",
  "manifest_version": 2,
  "description": "It is the Theme about the movie \"Epic\". Which is a beautiful Animated Movie. This theme will give your Firefox the Epic environment."
}