Examine source code of CASHBACK PRO

{
  "description": "Кэшбэк сервис Cashback.Pro",
  "version": "1.0.38",
  "name": "CASHBACK PRO",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon16.png"
  },
  "externally_connectable": {
    "matches": [
      "https://*.cashback.pro/*",
      "https://*.infourok.ru/*"
    ]
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "identity",
    "clipboardWrite",
    "storage",
    "cookies",
    "webRequest",
    "tabs",
    "contextMenus",
    "alarms",
    "*://*/*"
  ],
  "content_security_policy": "script-src 'unsafe-eval' 'self' https://static.epayments.com https://static.zdassets.com https://ekr.zdassets.com; object-src 'self'"
}