As Administrator, Firefox was updated 07.03.15 and I can't log into Facebook, but I can login under another user on same computer that is running a 05.15.15 version of Firefox and I can login to Facebook. I have installed Malwarebytes.org and run several times. Threats have been deleted. Potentials have been deleted. I have gone under Firefox properties under Administrator <Compatibility tab and toggled Run this program in compatibility mode for <Windows 7. Nothing works - why does this happen? Why can I login on same computer, but not as administrator? HELP