So if you're signed in to your Google account, visit Microcosm and click log in, then enter your @gmail.com address it'll allow you to use your Google account to authenticate.
If it's not an email address associated with a Google account, then you get asked for your Persona password instead.
So if you're signed in to your Google account, visit Microcosm and click log in, then enter your @gmail.com address it'll allow you to use your Google account to authenticate.
If it's not an email address associated with a Google account, then you get asked for your Persona password instead.
They sort-of explain it here:
Gmail Identity Bridge for Mozilla Persona - YouTube