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manifest.json
{
  "manifest_version": 2,
  "name": "TST insert as next sibling",
  "version": "1.0",
  "description": "",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a1d351b0-b39f-47d7-9781-7cc690baf98f}"
    }
  }
}