Examine source code of Speed Meter

{
  "theme": {
    "images": {
      "theme_frame": "kchanclocks_ph.jpg"
    },
    "colors": {
      "frame": "#666666",
      "tab_background_text": "#bdbebf"
    }
  },
  "version": "2.0",
  "name": "Speed Meter",
  "manifest_version": 2,
  "description": "mobile flash clock\n<a href=\"https://outgoing.prod.mozaws.net/v1/aa39b1c6800696c975fdbae99b28460de738b91ab7aa70329d1d49de54e817b7/http%3A//kchanclocks.web.fc2.com/\" rel=\"nofollow\">http://kchanclocks.web.fc2.com/</a>"
}