Yes. I use this for Discord (sometimes) and PulseSms (https://pulsems.app) all the time.
Using Orion pinned tabs are much lighter than Electron/Firefox, but unfortunately lack of notifications make them very hard to use.
Some users rely on web notifications a lot, so this seems like a fairly serious regression to me âšī¸ .
I think this was working in Orion a month or two ago, so this is not just a missing feature but a regression.