Examine source code of IPnox

{
  "name": "IPnox",
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "storage",
    "proxy",
    "privacy"
  ],
  "background": {
    "scripts": [
      "lib/jquery-3.0.0.min.js",
      "lib/chrome-storage.js",
      "storage.js",
      "proxyAdapter.js",
      "dataService.js",
      "bg.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "img/disabled.png"
    },
    "default_popup": "popup.html",
    "default_title": "IPnox"
  },
  "default_locale": "en",
  "description": "Change Your IP Address for Free!",
  "icons": {
    "48": "img/icon.png"
  },
  "manifest_version": 2,
  "minimum_chrome_version": "48",
  "short_name": "HMIP",
  "version": "1.0.33",
  "applications": {
    "gecko": {
      "id": "admin2@myprivacytools.com",
      "strict_min_version": "91.1.0"
    }
  }
}