Examine source code of W3Schools Time Tracker

{
  "manifest_version": 3,
  "name": "W3Schools Time Tracker",
  "version": "1.0",
  "description": "Отслеживает время, проведённое на w3schools.com",
  "permissions": [
    "storage",
    "tabs",
    "idle"
  ],
  "host_permissions": [
    "*://*.w3schools.com/*",
    "http://127.0.0.1/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.w3schools.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "W3Schools Time Tracker",
    "default_icon": {
      "48": "icons/icon-48.png"
    }
  },
  "icons": {
    "48": "icons/icon-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "w3schools-tracker@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}