Examine source code of dota-raill

{
  "manifest_version": 2,
  "version": "1.0",
  "description": "A test extension from webext-generator.",
  "name": "dotah-salew-raill",
  "browser_specific_settings": {
    "gecko": {
      "id": "{aa6cd532-1c6f-4dd6-a61d-e6dbfd0cbd8a}"
    }
  }
}