Bypass SSO to allow multiple logins to Service Portal using one browser

Hi guys! Just wanna ask if there is a way to simultaneously login multiple users in Service Portal using one browser? We have SSO enabled so it automatically logs me in.

I tried to use the link:  http://server/dbinstance/ServiceManager.aspx?Lite&NOAUTH=1

but returned me the error: "User ID xxxx cannot login using NOAUTH"

Btw, we are using VSM 9.1.4.

Thanks!