Examine source code of mushroom field

{
  "theme": {
    "images": {
      "theme_frame": "headershroom.jpg"
    },
    "colors": {
      "frame": "#8a07ed",
      "tab_background_text": "#0e3605"
    }
  },
  "version": "2.0",
  "name": "mushroom field",
  "manifest_version": 2,
  "description": "Mushroom grass field dew drops chill nature shroom trip"
}