The program is set to as a normal user, as a default. The normal user has normal rights, not admin rights, This does stop malware from adding registry files or modifying system32. There are more rights you can modify by simply adding something to the shortcut.
The Following Rights are: Normal User ('N'), Constrained ('C'), Untrusted ('U'). To change these you must add the letter like this C so for example the path must be this: C:\DropMyRights.exe "C:\Program Files\Mozilla Firefox\firefox.exe" C