Examine source code of Sibling Rivalry

{
  "theme": {
    "images": {
      "theme_frame": "SiblingRivalryTOP.jpg"
    },
    "colors": {
      "frame": "#dedede",
      "tab_background_text": "#3d2d3a"
    }
  },
  "version": "2.0",
  "name": "Sibling Rivalry",
  "manifest_version": 2,
  "description": "Samplings of my distinctive brand of pop surrealist fine art - modified to spice up your browser.\nBy Artist Oli Goldsmith\nto see more visit <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/df24586fc52eb174ab7d546bfbf44b535874a7c7c77710c64d3d4b2e9b69eb32/http%3A//www.oligoldsmith.com\">http://www.oligoldsmith.com</a>\nemail oligoldsmith @ gmail . com"
}