chromium/chrome/test/data/extensions/api_test/webrequest_activetab/manifest.json

{
  "name": "ActiveTab WebRequest",
  "description": "Testing that web request works with activeTab",
  "manifest_version": 2,
  "permissions": ["webRequest", "<all_urls>"],
  "version": "0.1",
  "background": {
    "scripts": ["background.js"],
    "persistent": true
  }
}