Tor should be used for normal web browsing without exception. Whenever logging into an existing user account is required, another browser should be used for security and anonymity. (Unless you are using it to avoid censorship). Once you log in to an account via Tor, there is a risk that your browsing behavior can in turn be tracked by tracking techniques. With unencrypted connections, the exit node can also see the input. Therefore, no sensitive data should be routed through the Tor network.