Examine source code of infiniteExtension

{
  "manifest_version": 2,
  "name": "extention",
  "author": "vaishnavi",
  "version": "1.0.2",
  "description": "replace new tab with this",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3c7ef9ba-e63b-4fa9-81b3-4d7afb0ff5d9}"
    }
  }
}