Kill all method

kill_all.py

    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.WindowManager.getRunningApps();
            for (let origin in runningApps) {
              if (origin.indexOf('homescreen') == -1) {
                window.wrappedJSObject.WindowManager.kill(origin);
              }
            }

            if (!originsToClose.length) {
              marionetteScriptFinished(true);
              return;
            }

            originsToClose.slice(0).forEach(function(origin) {
              kill(origin, function() {});
            });
          };
          killAll();
          """)

@bebef1987 can you change WindowManager to be AppWindowManager ?