question regarding this:

Is it safe to use my account while on public wifi?

No, not without first taking additional steps. To prevent someone from hacking into your account while on a public wifi network, you should use a service like Private Tunnel VPN.

Are you saying that the login credentials are not sent using HTTPS? To say that a VPN is necessary for safe public wifi use implies that there is an inherent need to trust ISPs and VPN providers (because they can obviously see as much of your traffic as a public wifi snoop can).