A kill switch similar to duck. But better of course!! 
But it would be a nice option especially considered it’s a privacy based browser if someone needs to exit on demand and wants to clear all data it would be pretty cool to have a button to delete all tabs Cashe ETC?? Maybe even swap the exit in menu for a kill button?? Most of us that are privacy focused I know myself at least when I close I want it white that’s why I moved to this browser. Everything’s great burning on my z-fold six it’s smooth just thought it would be a good add-on!! 
