i don’t want to open it manually every time i shut down the mirror

I have no problems with the installation of the Magic Mirror Interface, only with the autostart at the end.

I tried like every imagineable way listed on the web;

1. Midori Browser Autostart -benjaminroesner.com
   2.Midori Browser Autostart -Ibex (over etc/xdg/lxsession/LXDE/autostart)
2. autostart of the browser over etc/xdg/lxsession/LXDE-pi -forum raspberry-pi

None of the worked except of solution of 1, but it only opened a little window at the right top of the monitor.
The other solutions did end with a black screen after restart.