Examine source code of Gatry Shades

{
  "manifest_version": 2,
  "name": "Gatry Shades",
  "description": "Opções de temas para o Gatry.com",
  "version": "1.1.6",
  "content_scripts": [
    {
      "run_at": "document_start",
      "all_frames": true,
      "js": [
        "js/listener.js"
      ],
      "css": [
        "css/main.css"
      ],
      "matches": [
        "*://gatry.com/*"
      ]
    }
  ],
  "background": {
    "persistent": false,
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icone32.png",
    "default_popup": "menu.html",
    "default_title": "Gatry Shades"
  },
  "icons": {
    "16": "icons/icone16.png",
    "32": "icons/icone32.png",
    "64": "icons/icone64.png",
    "128": "icons/icone128.png"
  },
  "omnibox": {
    "keyword": "gatry"
  },
  "permissions": [
    "storage"
  ],
  "web_accessible_resources": [
    "images/*.png",
    "css/*.css"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self';",
  "browser_specific_settings": {
    "gecko": {
      "id": "{2a532519-b26e-4b8a-ab53-ebba92118e1e}"
    }
  }
}