Windows – Change selection mode in Windows command prompt

You could create a separate profile in Firefox for your "chromeless mode." To do that open the profile manager:

"\Program Files\Mozilla Firefox\firefox.exe" -ProfileManager

Create a new profile called "Chromeless"

• Open the profile and hide the navigation and bookmark toolbars.
• In the Options under Tabs make sure that "Always show the tab bar" is unchecked.
• Install the Hide Menubar extension to hide the menu bar

Setup a shortcut to launch your new profile:

"\Program Files\Mozilla Firefox\firefox.exe" -no-remote -P Chromeless

Not on a System file.

You could unhide the Administrator account, log into that account, then you don't need to use the "run as admin" on any program, it is done by default.

EDIT

Possible Solution:

Right click on cmd shortcut, select Properties, go to shorcut tab, hit advanced button, tick "Run as administrator", hit OK,OK.