zacc

    def kill_all(self):
            self.marionette.switch_to_frame()
            self.marionette.execute_async_script("""
                // Kills all running apps, except the homescreen.
                function killAll() {
                let originsToClose = [];
                let that = this;

                let runningApps = window.wrappedJSObject.AppWindowManager.getRunningApps();
                for (let origin in runningApps) {