Examine source code of Faster Preload

{
  "manifest_version" : 3 ,
  "default_locale" : "es" ,
  "name" : "__MSG_extensionName__" ,
  "version" : "1.0.2",
  "description" : "__MSG_extensionDescription__" ,
  "browser_specific_settings": {
    "gecko": {
      "id": "faster-preload@narixasoft.es",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions" : [
    "storage" ,
    "tabHide" ,
    "alarms" ,
    "tabs" 
  ],
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "action" : {
    "default_title" : "Pestañas precargadas",
    "default_popup" : "popup.html"
  },
  "icons" : {
    "128" : "app-logo.png"
  },
  "options_ui" : {
    "page": "options.html" ,
    "open_in_tab": true
  },
  "content_scripts" : [
    {
      "matches" : [
        "<all_urls>" 
      ],
      "js" : [
        "content.js" 
      ],
      "run_at" : "document_start" 
    }
  ]
}