Examine source code of Laneros browser extension

{
  "manifest_version": 3,
  "name": "__MSG_extension_name__",
  "description": "__MSG_extension_description__",
  "version": "12.2.0.0",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "default_locale": "es",
  "action": {
    "default_title": "__MSG_extension_short_name__",
    "default_popup": "popup.html"
  },
  "permissions": [
    "notifications",
    "alarms",
    "storage"
  ],
  "host_permissions": [
    "https://*.laneros.com/",
    "https://*.laneros.net/"
  ],
  "author": "Alvaro Arturo",
  "browser_specific_settings": {
    "gecko": {
      "id": "arthvrian@yahoo.com"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  }
}