Examine source code of Please no W3Schools

{
  "manifest_version": 2,
  "name": "Please no W3Schools",
  "version": "1.1.0",
  "description": "Strikes-through and hides www.w3schools.com links",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.duckduckgo.com/*",
        "*://*.google.com/*",
        "*://*.bing.com/*",
        "*://*.ecosia.org/*",
        "*://*.yahoo.com/*"
      ],
      "css": [
        "no-w3schools.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{221ef62b-44e6-46a8-8381-cf7bd09b5400}"
    }
  }
}