Examine source code of Sky_trainyard_01

{
  "name": "Sky_trainyard_01",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Sky_trainyard_01.jpg"
    },
    "colors": {
      "frame": "rgba(170, 189, 235, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7e34a568-becf-4969-88de-8cbe22960d9c}"
    }
  }
}