chromium/chrome/test/data/extensions/api_test/window_open/popup_iframe/manifest.json

{
  "name": "window.open from iframe Test",
  "version": "1",
  "manifest_version": 2,
  "description": "Test window.open() from a iframe within an extension page",
  "background": {
    "scripts": ["background.js"]
  }
}