Examine source code of Refined Hacker News

{
  "name": "Refined Hacker News",
  "short_name": "Refined HN",
  "version": "22.12.17",
  "description": "✨ Add useful features and tweak a few stuff to make the HN experience better without changing the look and feel",
  "homepage_url": "https://github.com/plibither8/refined-hacker-news",
  "manifest_version": 2,
  "permissions": [
    "storage",
    "history",
    "tabs",
    "*://news.ycombinator.com/*",
    "*://hacker-news.firebaseio.com/v0/*",
    "*://title.mihir.ch/*",
    "*://wayback.now.sh/*",
    "*://hn.algolia.com/*"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "128": "icon.png"
  },
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "*://news.ycombinator.com/*"
      ],
      "js": [
        "custom-css.js"
      ]
    },
    {
      "run_at": "document_end",
      "matches": [
        "*://news.ycombinator.com/*"
      ],
      "css": [
        "refined-hacker-news.css"
      ],
      "js": [
        "browser-polyfill.min.js",
        "refined-hacker-news.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "loader.gif"
  ],
  "applications": {
    "gecko": {
      "id": "refinedhackernews@mihir.ch"
    }
  }
}