Examine source code of Lines of Fire

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Lines of Fire",
  "manifest_version": 2,
  "description": "All credit to <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/6f097e82ec6a64ea854d674c64fd5dd3a3107cddeab0d6dde33e0d8d9845434c/http%3A//psdgraphics.com\">psdgraphics.com</a> for the original image."
}