Disable window resizing

Hi guys!

I wanted to add settings to prevent window resizing.

lockPref("dom.disable_window_move_resize", false);

lockPref("services.sync.prefs.sync.browser.urlbar.suggest.searches", true);

But that does not work. I have to manually expand the window to full screen. I must say that I have not used these settings since Librefox and maybe something has changed since then.