Examine source code of lovely winter sky

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#4d3d49",
      "tab_background_text": "#edece8"
    }
  },
  "version": "2.0",
  "name": "lovely winter sky",
  "manifest_version": 2,
  "description": "Overnight snow and blue skies in our little village in the south of Germany"
}