Examine source code of Hacker News comments

{
  "manifest_version": 2,
  "name": "Hacker News comments",
  "version": "1.3",
  "description": "A little extension for marking good comments on a Hacker News post",
  "browser_specific_settings": {
    "gecko": {
      "id": "hn-comments@hoelz.ro"
    }
  },
  "permissions": [
    "storage",
    "menus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://news.ycombinator.com/item?id=*"
      ],
      "js": [
        "content-script.js"
      ],
      "css": [
        "content-script.css"
      ]
    }
  ]
}