Examine source code of Blueprint_Breadboard

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#2c3947",
      "tab_background_text": "#b8cfac"
    }
  },
  "version": "2.0",
  "name": "Blueprint_Breadboard",
  "manifest_version": 2,
  "description": "Blueprint Breadboard (blue) pattern based upon the printed circuit board theme."
}