Examine source code of Do something great

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Do something great",
  "manifest_version": 2,
  "description": "Photo by:<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/e782b11d537c571c1520725b4237ac3a1f8beb1903a7b91c06704776a397e867/https%3A//unsplash.com/%40clarktibbs\">https://unsplash.com/@clarktibbs</a>"
}