Show Firefox push notifications from websites in windows native notification bar instead of a disappearing rectangle and can't be ever recovered! All Windows apps do this, I don't know why Firefox doesn't.
@TsukiZero- If you don't like the bulky Windows Toast notifications, you can configure Windows to use the old-style bubble notifications. I haven't tried this myself, but if you want smaller notifications, this seems like it'll help: https://www.makeuseof.com/windows-11-10-balloon-notifications/