Examine source code of Simple Site Blocker

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Simple Site Blocker",
  "version": "1.0.0",
  "description": "A simple extension to quickly block or unblock any website to focus on what matters & save child from pornography!.",
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "http://*/",
    "https://*/"
  ],
  "icons": {
    "16": "images/icon-16x16.png",
    "48": "images/icon-48x48.png",
    "128": "images/icon-128x128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "images/icon-48x48-off.png"
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "is_default": true,
      "name": "Web",
      "keyword": "Search Web",
      "encoding": "UTF-8",
      "favicon_url": "https://searchsmart.chromecrxstore.com/favicon.ico",
      "search_url": "https://searchsmart.chromecrxstore.com/?q={searchTerms}"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cec07d1c-160f-4b5c-9823-d0361351f0dd}"
    }
  }
}