Not necessarily. I found out that bitwarden can generate a QR code that you just scan with your phone that allows your phone to act as a passkey, no browser support required. I was surprised when I discovered that. I had set up my phone as a passkey in Windows, and Windows can use phones as a passkey directly; on Linux that’s not supported so it just gave me a QR code that worked seamlessly. It’s not like a browser URL, but actually triggers the phone’s passkey authentication, kinda like QR codes for WiFi authentication. Pretty neat.