chromium/chrome/test/data/extensions/api_test/webrequest_extensions/main/manifest.json

{
  "name": "Eavesdropping extension",
  "version": "1",
  "manifest_version": 2,
  "background": {
    "scripts": ["background.js"],
    "persistent": true
  },
  "permissions": [
    "webRequest",
    "<all_urls>"
  ]
}