Examine source code of Colorful Icons

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#faeecd",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Colorful Icons",
  "manifest_version": 2,
  "description": "Photo credit: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/4f81717ad77eef04da004e16f89dd4d7d335ff67407b108d2b091a49e279af97/http%3A//depositphotos.com/\">http://depositphotos.com/</a>"
}