Examine source code of Hacker Newsie

{
  "manifest_version": 3,
  "name": "Hacker Newsie",
  "description": "Follow Hacker News users; highlight their posts and get local notifications.",
  "version": "1.1.0",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "storage",
    "alarms",
    "notifications"
  ],
  "host_permissions": [
    "https://hacker-news.firebaseio.com/*",
    "https://news.ycombinator.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://news.ycombinator.com/*"
      ],
      "js": [
        "content/hn-top-color.iife.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "https://news.ycombinator.com/*"
      ],
      "js": [
        "content/highlight.iife.js",
        "content/inject-sidebar.iife.js"
      ],
      "css": [
        "sidebar/sidebar.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_icon": {
      "16": "icons/16.png",
      "32": "icons/32.png"
    }
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": false
  },
  "web_accessible_resources": [
    {
      "resources": [
        "sidebar/sidebar.html",
        "sidebar/sidebar.css",
        "sidebar/sidebar.js",
        "chunks/*.js",
        "icons/*.png"
      ],
      "matches": [
        "https://news.ycombinator.com/*"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "default-src 'self'; connect-src https://hacker-news.firebaseio.com https://news.ycombinator.com; script-src 'self'; object-src 'self'"
  },
  "background": {
    "service_worker": "background/sw.js",
    "scripts": [
      "background/sw.js"
    ],
    "type": "classic"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "hackernewsie@example.com",
      "strict_min_version": "114.0"
    }
  }
}