Examine source code of YouTube Timing Tracker

{
  "manifest_version": 3,
  "name": "YouTube Timer",
  "version": "1.0",
  "description": "Track how much time you spend on YouTube with an ever-counting, always present visual to mitigate time-wasting on that sometimes useful, yet often hub for procrastination.",
  "permissions": [
    "storage"
  ],
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "jaybarrieanderson@gmail.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "View YouTube Time"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ]
}