Examine source code of Leery

{
  "manifest_version": 2,
  "name": "Leery",
  "version": "2.0",
  "description": "Notifies when visiting a leery site with insecure settings.",
  "icons": {
    "48": "icons/detective-48.png",
    "96": "icons/detective-96.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/detective-16.png",
      "32": "icons/detective-32.png"
    },
    "default_title": "",
    "default_popup": "popup/leery.html"
  },
  "permissions": [
    "webRequest",
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "util.js",
      "handlers.js",
      "background.js"
    ]
  }
}