Examine source code of upside down clouds

{
  "theme": {
    "images": {
      "theme_frame": "upsidedownclouds.jpg"
    },
    "colors": {
      "frame": "#4c92f5",
      "tab_background_text": "#f7efef"
    }
  },
  "version": "2.0",
  "name": "upside down clouds",
  "manifest_version": 2,
  "description": "cartoon upside down clouds"
}