A simple Chrome extension making use of the "background" permission and JS sleep function to preload Chromium-based browsers on OS startup and keep it running in the background.
It is a fork of https://github.com/StarterX4/chrome-preload-on-os-startup
Available on the Chrome Web Store,
or as a .crx in a .zip file in the Releases section.
https://developer.chrome.com/extensions/declare_permissions#background
https://developer.chrome.com/extensions/background_pages
https://stackoverflow.com/questions/951021/what-is-the-javascript-version-of-sleep/39914235#39914235