Examine source code of HNN Jump

{
  "manifest_version": 2,
  "name": "HNN Jump",
  "description": "Jump between parent comments on Hacker News",
  "version": "1.2resigned1",
  "content_scripts": [
    {
      "matches": [
        "*://news.ycombinator.com/*"
      ],
      "js": [
        "main.js"
      ],
      "css": [
        "main.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{16819fdf-6b06-4c98-ad2e-0e27c5573a84}"
    }
  }
}