Examine source code of Hacker News Mods

{
  "manifest_version": 2,
  "name": "Hacker News Mods",
  "version": "3",
  "description": "Some customizations for Hacker News",
  "permissions": [],
  "icons": {
    "128": "icon.jpg"
  },
  "content_scripts": [
    {
      "matches": [
        "https://news.ycombinator.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "NovaSquare-Regular.ttf"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{abcdef92-3496-7990-abcd-ef1239599890}"
    }
  }
}