Examine source code of minimal1-startpage

{
  "manifest_version": 2,
  "name": "minimal-startpage",
  "short_name": "minimal-startpage",
  "version": "0.2",
  "description": "Overrides the browsers newtab page with a custom startpage.",
  "author": "deepjyoti30",
  "icons": {
    "64": "img/icon64.png"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7ff7971c-f94c-4479-aa7f-85a728dfa1a0}"
    }
  }
}