Examine source code of Gatbsy.js Detector

{
  "version": "2.0.0",
  "name": "Gatbsy.js Detector",
  "short_name": "Gatbsy.js Detector",
  "description": "Extension to detect sites built with Gatsby.js",
  "manifest_version": 3,
  "author": "sibiraj-s",
  "icons": {
    "16": "images/production/gatsby-16x16.png",
    "32": "images/production/gatsby-32x32.png",
    "48": "images/production/gatsby-48x48.png",
    "128": "images/production/gatsby-128x128.png",
    "512": "images/production/gatsby-512x512.png"
  },
  "action": {
    "default_title": "Gatbsy.js Detector",
    "default_icon": {
      "16": "images/disabled/gatsby-16x16.png",
      "32": "images/disabled/gatsby-32x32.png",
      "48": "images/disabled/gatsby-48x48.png"
    },
    "default_popup": "popups/disabled.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "gatsbyDetector.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9f049a0a-8aae-44ac-9e54-b4068b445e6c}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; style-src 'self' 'unsafe-inline';"
  }
}