Examine source code of Shopszon

{
  "applications": {
    "gecko": {
      "id": "shopszon@gmail.com",
      "strict_min_version": "52.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_start",
      "js": [
        "lib/underscore-min.js",
        "lib/jquery-2.2.4.min.js",
        "content_page/content.js"
      ],
      "css": [
        "content_page/content.css"
      ]
    }
  ],
  "name": "Shopszon",
  "short_name": "Shopszon - надежный кэшбэк сервис",
  "default_locale": "ru",
  "icons": {
    "16": "icons/button.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    "res/*",
    "assets/*",
    "icons/*",
    "img/*.png",
    "icons/*.png"
  ],
  "description": "Shopszon Cash Back",
  "background": {
    "page": "background.html"
  },
  "homepage_url": "http://shopszon.com/",
  "version": "1.2.5resigned1",
  "manifest_version": 2,
  "content_security_policy": "script-src 'self' ; object-src 'self'",
  "browser_action": {
    "default_popup": "popup_page/popup.html",
    "default_icon": "icons/button19.png",
    "default_title": "Shopszon Cash Back"
  },
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*",
    "contextMenus",
    "webNavigation",
    "notifications",
    "cookies",
    "alarms",
    "storage"
  ]
}