Examine source code of YT-Tracker

{
  "manifest_version": 3,
  "name": "YT-Tracker",
  "description": "Take back control of your screen time.",
  "homepage_url": "https://github.com/Gwyd0/Youtube-Timer",
  "version": "1.0.3",
  "permissions": [
    "storage",
    "scripting",
    "tabs",
    "notifications"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "gwydcontactyoutubetimer@gmail.com",
      "strict_min_version": "109.0"
    }
  },
  "background": {
    "scripts": [
      "service-worker.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "timerYT.js"
      ]
    }
  ],
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg",
    "128": "icons/icon.svg"
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "YT-Tracker"
  }
}