Examine source code of Green Without Envy

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#15ff00",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Green Without Envy",
  "manifest_version": 2,
  "description": "Original image: <a href=\"https://outgoing.prod.mozaws.net/v1/6027be30d2aa81d734a3e62c36234be54352deaaa0bb0e56480eeceb7fbfe1fb/http%3A//dhartje.deviantart.com/art/Green-without-Envy-175160097%3Fq=&amp;qo=\" rel=\"nofollow\">http://dhartje.deviantart.com/art/Green-without-Envy-175160097?q=&amp;qo=</a>  Also made by me."
}