Examine source code of Circuit Board 2.0

{
  "theme": {
    "images": {
      "theme_frame": "header.JPG"
    },
    "colors": {
      "frame": "#616161",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Circuit Board 2.0",
  "manifest_version": 2,
  "description": "Your computer's circuit board."
}