Examine source code of Zap Contact Copy

{
  "name": "Zapp Contact Copy",
  "description": "Copie os dados dos contatos recebidos!",
  "version": "0.4",
  "manifest_version": 2,
  "icons": {
    "16": "lead16.png",
    "24": "lead24.png",
    "32": "lead32.png",
    "64": "lead64.png",
    "128": "lead128.png"
  },
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Zapp Contact Copy"
  },
  "commands": {
    "copy-contacts": {
      "suggested_key": {
        "default": "Ctrl+Shift+Z",
        "mac": "Command+Shift+Z"
      },
      "description": "Copia os dados dos contatos recebidos."
    }
  }
}