Examine source code of Soft White Petals

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#e3f0bd",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Soft White Petals",
  "manifest_version": 2,
  "description": "Stock image: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/533dbd6cc4ca8643d2f16c691a3d4216fddd00b1b7b643df633f4dbeb0479d47/http%3A//www.freeimages.com/photographer/nkzs-44577\">http://www.freeimages.com/photographer/nkzs-44577</a>"
}