chromium/chrome/test/data/extensions/api_test/webrequest/test_api/manifest.json

{
  "name": "webRequest",
  "version": "1.0",
  "manifest_version": 2,
  "description": "Tests the webRequest API.",
  "permissions": ["webRequest", "*://127.0.0.1/*"],
  "background": {
    "scripts": ["test_api.js"],
    "persistent": true
  }
}