Examine source code of To Do Today

{
  "manifest_version": 2,
  "name": "TodoToday",
  "version": "1.0",
  "description": "Style your new tab with a fancy to do list.",
  "author": "João Paulo Buchholz",
  "homepage_url": "https://github.com/jompa14/todo_today",
  "permissions": [
    "storage",
    "geolocation"
  ],
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5c120682-17a3-4878-b5c3-6f2c5506b76f}"
    }
  }
}