Examine source code of Okami Night City

{
  "theme": {
    "images": {
      "theme_frame": "Firefoxheader.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Okami Night City",
  "manifest_version": 2,
  "description": "Photo manipulation I made of Amaterasu in a dark city. \nFull size version can be found here: \n<a href=\"https://outgoing.prod.mozaws.net/v1/bb17733b3bdcd41f8255a16e56bf8c8e1435494c2cb944dd40ead65da6fa2567/http%3A//rudahn.deviantart.com/art/Watching-Over-You-179799713%3Fq=&amp;qo=\" rel=\"nofollow\">http://rudahn.deviantart.com/art/Watching-Over-You-179799713?q=&amp;qo=</a>"
}