How tight do you have your bindings

Was wondering how tight that some of you riders tie your bindings. I leave mine pretty loose on the top I am not sure if this is a good or bad thing cause I am also afraid of one foot coming out and hurting an ankle. Should the binding come off your foot easily on a fall. Also not sure if this is a factor but I am also not using any binding slime or anything like that? any comments are appreciated.