Examine source code of Emulador

{
  "manifest_version": 2,
  "name": "Emulador",
  "version": "1.1resigned1",
  "description": "Beautifies pornhub.",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.pornhub.com/*"
      ],
      "js": [
        "emulador.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2a804d15-e608-4b71-a846-81aae0e0793a}"
    }
  }
}