Examine source code of Keyword Deduplicator

{
  "manifest_version": 3,
  "name": "Keyword Deduplicator",
  "version": "1.1.0",
  "description": "Remove duplicate keywords instantly. Clean unique keyword lists in one click.",
  "action": {
    "default_popup": "popup.html",
    "default_title": "Keyword Deduplicator"
  },
  "icons": {
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "keyworddeduplicator@example.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}