Examine source code of My New Tab - mynewtab.org

{
  "manifest_version": 2,
  "name": "My New Tab",
  "short_name": "mynewtab",
  "description": "Add My New Tab for quick access to latest news, most visited sites, web search, weather and more.",
  "version": "3.5",
  "author": "mynewtab",
  "icons": {
    "128": "icon-mozilla.png"
  },
  "browser_action": {
    "default_icon": "icon-mozilla.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.mynewtab.org/*"
      ],
      "js": [
        "content-script.js",
        "script.js"
      ]
    }
  ],
  "chrome_settings_overrides": {
    "homepage": "https://mynewtab.org/",
    "search_provider": {
      "name": "mynewtab",
      "search_url": "https://www.safesearchengine.com/search?q={searchTerms}",
      "keyword": "mynewtab",
      "favicon_url": "https://mynewtab.org//favicon.icon",
      "is_default": true,
      "encoding": "UTF-8"
    }
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9cc389a8-5c9b-44bd-9a3f-d34fca40127a}"
    }
  }
}