Examine source code of FKwallet

{
  "manifest_version": 3,
  "name": "FKwallet",
  "short_name": "FKwallet",
  "version": "1.6.0",
  "description": "Управление кошельком FKwallet: баланс, история, переводы + автоопределение СБП QR на страницах",
  "browser_specific_settings": {
    "gecko": {
      "id": "fkwallet@fkwallet.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "storage",
    "notifications",
    "alarms",
    "activeTab"
  ],
  "host_permissions": [
    "https://api.fkwallet.com/*",
    "https://qr.nspk.ru/*",
    "https://s.nspk.ru/*",
    "https://api.qrserver.com/*",
    "https://www.google-analytics.com/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "FKwallet",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "icons/*.png",
        "content_overlay.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  }
}