To use this registration and CfP system you need to login using Mozilla
Persona. Both gnome.org or fedorproject.org accounts can be used for
authentication (i.e. email@example.com).
If you do not have such an account then simply enter any email address you own. Some providers like Gmail can be used without further verification, in all other cases a verification email will be send to you and you can use this email address to authenticate afterwards (see the Mozilla Persona FAQ for more information).
You will need to authenticate with a third party service to log in. Some privacy extensions for browsers do not allow this. If you make use of these types of extensions and are experiences issues logging in, you may need to allow a temporary exception or to temporarily disable the extension.