Examine source code of Grassland changed.

{
  "theme": {
    "images": {
      "theme_frame": "0114--miwatasusougen-hate.jpg"
    },
    "colors": {
      "frame": "#d2f5ef",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Grassland changed.",
  "manifest_version": 2,
  "description": "草原は変化して。。"
}