Examine source code of Goal Countdown

{
  "manifest_version": 3,
  "name": "Goal Countdown",
  "description": "A motivational countdown timer to help you stay focused on your goals, visualize your progress, and use every second wisely.",
  "version": "1.0",
  "icons": {
    "16": "assets/icon16.png",
    "32": "assets/icon32.png",
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  },
  "action": {
    "default_icon": {
      "16": "assets/icon16.png",
      "32": "assets/icon32.png",
      "48": "assets/icon48.png"
    }
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "permissions": [
    "storage"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "assets/*",
        "index.html",
        "style.css",
        "logic.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "goalcountdown@dhirajarya.dev"
    }
  }
}