Examine source code of furui

{
  "manifest_version": 2,
  "name": "furui",
  "version": "0.3",
  "description": "filter for iwara",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.iwara.tv/video*"
      ],
      "js": [
        "content_scripts/furui.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options/options.html"
  },
  "web_accessible_resources": [
    "images/ng.png"
  ]
}