Examine source code of SCP Redirect

{
  "manifest_version": 2,
  "name": "SCP Redirect",
  "version": "420.69",
  "author": "-",
  "description": "Extensión de la rama SCP-ES",
  "content_scripts": [
    {
      "matches": [
        "*://*.scp-es.com/*"
      ],
      "js": [
        "SCP redirect.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ramaes@scpfoundation.com"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": "icon16.png",
    "default_title": "SCP Redirect",
    "default_popup": "scp.html"
  }
}