chromium/chrome/test/data/extensions/api_test/service_worker/messaging/tabs_send_message_without_callback/manifest.json

{
  "name": "Calls chrome.tabs.sendMessage without callback, https://crbug.com/1218569",
  "version": "0.1",
  "manifest_version": 3,
  "description": "service worker",
  "content_scripts": [{
    "matches": ["*://*/*"],
    "js": ["content_script.js"]
  }],
  "background": {"service_worker": "service_worker_background.js"}
}