Examine source code of Instant Typing Practice

{
  "manifest_version": 3,
  "name": "Webpage Typing Practice",
  "version": "1.0.0",
  "description": "Transform any webpage content into interactive typing practice sessions while preserving original formatting",
  "browser_specific_settings": {
    "gecko": {
      "id": "webpage-typing-practice@example.com"
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/settings-manager.js",
        "content/metrics-calculator.js",
        "content/hints-ui.js",
        "content/stats-popup.js",
        "content/personal-records.js",
        "content/inline-typing.js",
        "content/content-script.js"
      ],
      "css": [
        "content/typing-interface.css"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "service_worker": "background/background.js",
    "scripts": [
      "background/background.js"
    ]
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "Webpage Typing Practice",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "content/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}