Examine source code of Great Discounter

{
  "manifest_version": 2,
  "name": "Great Discounter",
  "description": "Кешбэк сервис Great Discounter",
  "version": "1.0.1",
  "icons": {
    "19": "icons/icon_19x19.png",
    "48": "icons/icon_48x48.png",
    "128": "icons/icon_128x128.png"
  },
  "browser_action": {
    "default_icon": "icons/icon_19x19.png",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "lib/jquery.min.js",
      "lib/axios.min.js",
      "lib/URI.js",
      "background.js"
    ]
  },
  "permissions": [
    "webRequest",
    "tabs",
    "activeTab",
    "storage",
    "https://greatdiscounter.ru/*",
    "https://www.google.com/search*",
    "https://yandex.ru/search*"
  ],
  "default_locale": "ru",
  "web_accessible_resources": [
    "css/*",
    "lib/*",
    "fonts/*",
    "icons/*",
    "popup.html"
  ]
}