Examine source code of SelectionSeal

{
  "manifest_version": 3,
  "name": "SelectionSeal",
  "version": "1.0.0",
  "description": "Create SHA-256 fingerprints and compact stats for selected page text.",
  "icons": {
    "48": "seal/icon-48.png",
    "96": "seal/icon-96.png",
    "128": "seal/icon-128.png"
  },
  "action": {
    "default_title": "SelectionSeal",
    "default_popup": "sealbox/home.html",
    "default_icon": {
      "48": "seal/icon-48.png"
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "clipboardWrite"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3dc676b8-7fa4-405f-86cc-e1ec9e49de2a}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}