Examine source code of Tab Sounds

{
  "manifest_version": 2,
  "name": "Tab Sounds",
  "version": "1.2",
  "description": "Reproduce sonidos personalizados para eventos de pestañas.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5819e091-80ee-4988-a19a-81c55efdb12a}"
    }
  }
}