Examine source code of Winter Meadow

{
  "theme": {
    "images": {
      "theme_frame": "frostymeadow_header.jpg"
    },
    "colors": {
      "frame": "#120301",
      "tab_background_text": "#021417"
    }
  },
  "version": "2.0",
  "name": "Winter Meadow",
  "manifest_version": 2,
  "description": "Images from a frost-bitten meadow"
}