I have been trying to install Firefox on a Windows computer running Windows 10 Pro. I have two users on the computer. I have installed Firefox successfully on the main user but every time I try to install for the second user, it does not install. it says it failed and leaves a strange icon on the desktop which, when I click, it deletes the file. I am not sure why. I have installed the same on 11 other computers with two users and no problem with those ones.