Examine source code of Voyhoy board

{
  "manifest_version": 2,
  "name": "Voyhoy board",
  "version": "2.1resigned1",
  "description": "Extensión para mejorar el trello de Voyhoy.com",
  "author": "Voyhoy.com",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://trello.com/*/*"
      ],
      "css": [
        "style.css"
      ],
      "js": [
        "jquery.js",
        "load_trello_vh.js"
      ]
    }
  ],
  "page_action": {
    "default_icon": "icon128.png",
    "default_title": "Extensión para mejorar el trello para Voyhoy.com"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fa83a8ec-1573-4c47-aca1-e040e916f467}"
    }
  }
}