Examine source code of FocusFox

{
  "manifest_version" : 3 ,
  "name" : "FocusFox",
  "version" : "1.0.1",
  "description" : "A focused browser homepage with search engines and customizable shortcuts.",
  "browser_specific_settings": {
    "gecko": {
      "id": "focusfox@example.com"
    }
  },
  "chrome_url_overrides" : {
    "newtab" : "index.html"
  },
  "permissions" : [
    "storage" 
  ]
}