Examine source code of Multitasktab

{
  "short_name": "Multitasktab",
  "manifest_version": 2,
  "version": "1.0.1",
  "name": "Multitasktab",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e6a5e6b6-b89e-4fd1-a221-03afca3c385f}"
    }
  }
}