chromium/chrome/test/data/extensions/trigger_actions/browser_action_popup/manifest.json

{
  "name": "A browser action with a popup displaying a simple message",
  "version": "1.0",
  "manifest_version": 2,
  "permissions": [
    "tabs", "http://*/*", "https://*/*"
  ],
  "browser_action": {
      "default_icon": "icon.png",
      "default_popup": "popup.html"
  }
}