Examine source code of MinStart

{
  "manifest_version": 2,
  "name": "Startpage",
  "version": "1.0",
  "description": "simple startpage",
  "icons": {
    "48": "ico-48.ico",
    "96": "ico-96.ico"
  },
  "chrome_settings_overrides": {
    "homepage": "index.html"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{912919f2-54a4-488d-9153-3c6395021a2c}"
    }
  }
}