I vote for this feature as well. I also log into a password manager each time I accidentally close Firefox and then re-launch it. It would be great to see as an option in the settings screen - not everyone will want to turn it on, but many people wil...
Working around this personally by having multiple WebAuthn methods, but this would be a deterrent for most non-techie people who want to take advantage of passwordless authentication and aren't buying hardware security keys and don't want to use othe...
