Examine source code of ToDO.ext

{
  "manifest_version": 2,
  "name": "ToDO.ext",
  "author": "Abhijeet Choudhary",
  "version": "1.0.5",
  "description": "ToDo.ext is an extension with which you can set your main/focus task of the day and also create your own todo.",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9ed29533-4b49-4de9-bfce-6e484da7161d}"
    }
  }
}