Currently the only way to sign up for a personal account is through google. Is there another way that I am missing, or are there any plans to provide email based signups in the future?
We don't currently have any plans to add additional authentication mechanisms but we've heard this feedback from a couple folks and we'll sit down to prioritize it after the excitement of launch has died down. Sorry about that!
I would like to try your product, but am wary of typing in my Google credentials into an unknown, black-box browser. It's too easy to MITM, especially if someone redistributes a copy with a keylogger shimmed in.
The token-based auth means you can still log in with Google but never have to share your Google password with the proprietary Replay browser. Probably many of the multi-login vendors support something similar already if you don't want to deal with it yourself.