Examine source code of Formatter Toolbox

{
  "manifest_version": 3,
  "name": "Formatter Toolbox",
  "version": "1.2",
  "description": "A toolbox for JSON, XML formatting and more...",
  "author": "Shasika Semasinghe",
  "action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "permissions": [],
  "host_permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "formatter-toolbox@shasika",
      "strict_min_version": "109.0"
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self';"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "libs/pickr/**"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}