Examine source code of CSSVarVault

{
  "manifest_version": 3,
  "name": "CSSVarVault",
  "version": "1.0.0",
  "description": "Inspect CSS custom property declarations, references, and unresolved var() usage on the active page.",
  "icons": {
    "48": "insignia/icon-48.png",
    "96": "insignia/icon-96.png",
    "128": "insignia/icon-128.png"
  },
  "action": {
    "default_title": "CSSVarVault",
    "default_popup": "dashboard/forge.html",
    "default_icon": {
      "48": "insignia/icon-48.png"
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "tabs",
    "clipboardWrite"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e7438c20-f7d4-4217-8a25-6f16d9ab5549}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}