Examine source code of RE-FOCUS

{
  "manifest_version": 2,
  "name": "RE-FOCUS",
  "author": "Rohit Abhishek",
  "version": "1.0.4",
  "description": "Replace new tab screen with your today's Main Focus, Weather,Time,Todos,Google Search and Some anime quotes.",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fcc9ce33-dd3b-4f2f-8c69-6f355cd9001a}"
    }
  }
}