Examine source code of Extenso FOCUS

{
  "manifest_version": 2,
  "name": "Extenso FOCUS",
  "author": "Akshita",
  "version": "1.0",
  "description": "a cool browser extension to help you stay focused and be aligned with your to-do list",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{08828e74-3cdd-454a-a4cb-03055642f3a6}"
    }
  }
}