Examine source code of Hacker News preview

{
  "manifest_version": 2,
  "name": "Hacker News preview",
  "version": "0.0.1",
  "description": "Preview hacker news posts",
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://news.ycombinator.com/*"
      ],
      "js": [
        "script.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "permissions": [
    "https://news.ycombinator.com/*",
    "*://hackernews.xyz/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3a697b44-bbf9-49fb-84da-dcadcd4f17f4}"
    }
  }
}