Examine source code of Auto Tab Switcher plus

{
  "manifest_version": 2,
  "name": "Auto Tab Switcher",
  "version": "1.1",
  "description": "Cambia automáticamente entre pestañas y se desactiva cuando interactúas",
  "browser_specific_settings": {
    "gecko": {
      "id": "auto-tab-switcher@hierofante.satnet.net",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "author": "Christian Francis",
  "homepage_url": "https://hierofante.satnet.net:3001/",
  "developer": {
    "name": "Christian Francis",
    "url": "https://hierofante.satnet.net:3001/"
  },
  "permissions": [
    "tabs",
    "storage",
    "menus"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Auto Tab Switcher\n\nClick izquierdo: Iniciar/Detener\nClick derecho: Menú de configuración",
    "default_icon": {
      "16": "icons/icon-16.svg",
      "48": "icons/icon-48.svg",
      "96": "icons/icon-96.svg"
    }
  },
  "icons": {
    "16": "icons/icon-16.svg",
    "48": "icons/icon-48.svg",
    "96": "icons/icon-96.svg"
  }
}