Examine source code of 4chan Reply Sort

{
  "manifest_version": 2,
  "name": "4chan Reply Sort",
  "version": "1.0",
  "description": "Sorts 4chan threads to have the posts with most replies at the top",
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://boards.4chan.org/*/thread/*"
      ],
      "js": [
        "cont_sort.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bbaaec24-677f-4527-8845-61ce91a872a6}"
    }
  }
}