How to use webauthn without key fob

I have tried my firefox 62 and chromium on various webauthn examples and I could not make any of them work. Are those supposed to work without special hardware? I activated security.webauth.webauthn_enable_softtoken in about:config. Though I can't find much documentation on what exactly it does. Is webauthn ever supposed to work without special hardware?

• https://webauthn.bin.coffee/
• https://webauthn.io/
• https://webauthndemo.appspot.com/