Examine source code of PosibleTroll

{
  "manifest_version": 2,
  "name": "PosibleTroll",
  "version": "1.1",
  "description": "Muestra una alerta en los twitts de gente con perfil sospechoso",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*"
      ],
      "js": [
        "posibletroll.js"
      ]
    }
  ]
}