Examine source code of Kiva.org

{
  "theme": {
    "images": {
      "theme_frame": "kiva_firefox2.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Kiva.org",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/c7fa3a5ae5a97dc9ff7c61f7054930528c8114fb795e990a9ac960f8bd071672/http%3A//Kiva.org\" rel=\"nofollow\">Kiva.org</a>"
}