Examine source code of Hackers New

{
  "manifest_version": 2,
  "name": "Hackers New",
  "version": "1.0.6resigned1",
  "description": "Show items from HN's /newest page on the Hacker News front page.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "*://hacker-news.firebaseio.com/*",
    "*://news.ycombinator.com/*",
    "alarms",
    "storage"
  ],
  "background": {
    "scripts": [
      "refresh-new.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "display-new.js"
      ],
      "matches": [
        "*://news.ycombinator.com/",
        "*://news.ycombinator.com/news*"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4ddee18a-b05d-4b09-90dd-1451240a4100}"
    }
  }
}