Examine source code of Whois Checker

{
  "name": "Whois Checker",
  "version": "1.1resigned1",
  "manifest_version": 2,
  "description": "Easily check your IP address with one simple click",
  "background": {
    "scripts": [
      "js/main.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "images/icon.19.png",
      "38": "images/icon.38.png"
    },
    "default_title": "Show my IP",
    "default_popup": "popup.html"
  },
  "icons": {
    "128": "images/icon.128.png"
  },
  "minimum_chrome_version": "17",
  "permissions": [
    "storage",
    "alarms",
    "webRequest",
    "tabs",
    "*://*/*",
    "webNavigation",
    "webRequestBlocking",
    "geolocation"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9078abc2-188c-4ef4-b167-f168d698ce71}"
    }
  }
}