Examine source code of Rainbow Line

{
  "theme": {
    "images": {
      "theme_frame": "header5.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Rainbow Line",
  "manifest_version": 2,
  "description": "Rainbow.  Colorful.  Gay pride.  Whatever you want it to be, it's here for your enjoyment.\n\nMade by:\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/41a098d7019187ffa292486433e03547ca79a5f10817034c116076c366c517ca/http%3A//www.KillBored.com\">http://www.KillBored.com</a>"
}