Examine source code of Certifice

{
  "manifest_version": 2,
  "name": "Certifice",
  "version": "1.0",
  "description": "Opens an information window, if you are using certified site from whitelist. Might be annoying.",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "applications": {
    "gecko": {
      "id": "certifice-rocks@totally-works.com"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*",
        "*://*.google.com/*",
        "*://*.google.ru/*",
        "*://*.mozilla.org/*",
        "*://*.chrome.com/*",
        "*://*.mit.edu/*",
        "*://*.greenfriends.ru/*",
        "*://*.example.org/*",
        "*://*.example.com/*",
        "*://*.stackoverflow.com/*",
        "*://*.yandex.ru/*"
      ],
      "js": [
        "splash.js"
      ]
    }
  ]
}