sssDntCls : keep last window Firefox

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manifest.json
{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "version": "1.0.3",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "permissions": [],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "dev_ssDntClss@sensyusya.co.jp",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon016.png",
    "48": "icons/icon048.png",
    "128": "icons/icon128.png"
  }
}

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