Examine source code of Mendix Developer Toolbar

{
  "manifest_version": 3,
  "name": "Mendix Developer Toolbar",
  "version": "1.2.0",
  "description": "A toolbar for Mendix developers to quickly access and manage their applications",
  "browser_specific_settings": {
    "gecko": {
      "id": "mendix-developer-toolbar@extension.local"
    }
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "optional_host_permissions": [
    "http://127.0.0.1/*",
    "http://localhost/*",
    "https://127.0.0.1/*",
    "https://localhost/*"
  ],
  "host_permissions": [
    "*://*.mendixcloud.com/*",
    "*://*.mxapps.io/*",
    "*://*.mendix.com/*",
    "*://*.apps.goudse.nl/*",
    "*://*.apps.dezeeuwse.nl/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.mendixcloud.com/*",
        "*://*.mxapps.io/*",
        "*://*.mendix.com/*",
        "*://*.apps.goudse.nl/*",
        "*://*.apps.dezeeuwse.nl/*",
        "http://127.0.0.1/*",
        "http://localhost/*",
        "https://127.0.0.1/*",
        "https://localhost/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_end"
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Mendix Developer Toolbar",
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "web_accessible_resources": [
    {
      "resources": [
        "assets/*",
        "mx-check.js",
        "mx-back.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  }
}