Examine source code of NewTabTodo

{
  "manifest_version": 3,
  "version": "0.2.0",
  "name": "NewTabTodo",
  "short_name": "NewTabTodo",
  "description": "Manage your day to day tasks by simply adding cards inside your browser's new tab",
  "homepage_url": "https://newtabtodo.bly.to/",
  "author": "Muhammad Ovi",
  "icons": {
    "16": "img/icons/x16.png",
    "32": "img/icons/x32.png",
    "48": "img/icons/x48.png",
    "128": "img/icons/x128.png"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "https://newtabtodo.bly.to/*"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "background": {
    "scripts": [
      "assets/js/backgroundScript.js"
    ]
  },
  "action": {
    "default_icon": {
      "16": "img/icons/x16.png",
      "32": "img/icons/x32.png",
      "48": "img/icons/x48.png",
      "128": "img/icons/x128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4e78662c-a9af-4e93-a985-b31c2094251d}"
    }
  }
}