Examine source code of Habr comments control

{
  "manifest_version": 2,
  "name": "Habr comments control",
  "version": "0.6.4",
  "description": "Настройки отображения информации на habr.com: свернуть ветви комментариев и пр. Add-on provides visual options for habr.com.",
  "default_locale": "ru",
  "icons": {
    "32": "hcc_32.png",
    "64": "hcc_64.png",
    "128": "hcc_128.png",
    "256": "hcc_256.png"
  },
  "permissions": [
    "https://habr.com/post/*",
    "https://habr.com/company/*",
    "https://habr.com/article/*",
    "https://habr.com/*/post/*",
    "https://habr.com/*/company/*",
    "https://habr.com/*/article/*",
    "https://habr.com/*/news/*",
    "https://habr.com/*/users/*",
    "storage"
  ],
  "browser_action": {
    "default_title": "Habr comments control",
    "default_icon": "hcc_64.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://habr.com/post/*",
        "https://habr.com/company/*",
        "https://habr.com/article/*",
        "https://habr.com/*/post/*",
        "https://habr.com/*/company/*",
        "https://habr.com/*/article/*",
        "https://habr.com/*/news/*",
        "https://habr.com/*/users/*"
      ],
      "js": [
        "client.js"
      ],
      "run_at": "document_end"
    }
  ],
  "homepage_url": "https://github.com/automatize-it/Chrome_extension_Habr_comments_control"
}