PWAs are neat, but have no multi-tab feature that I know of. I put in a feature request trying to inspire the Brave dev team to make some really neat PWA stuff. They can literally do anything they want as long as the future spec doesn't conflict. Super jealous of how fun it would be able to reinvent the web with total freedom.

View/modify PWA manifest on web-app/shortcut export

https://github.com/brave/brave-browser/issues/7729