Examine source code of Focus At Goal

{
  "manifest_version": 2,
  "name": "Focus At Goal",
  "author": "Rohit Prasad",
  "version": "1.2",
  "description": "An extension app to keep you focused at your goal.",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9077669d-d43a-483f-9d36-e59f3b66c7fa}"
    }
  }
}