I got a new laptop, win 10. I set up an administrator account for me and a standard account for my wife. I transferred my profile to my account and installed Firefox. Works perfectly. I transferred my wife's profile and installed Firefox on her account. Works perfectly. When I went back to my account, I found two Firefox icons, both pointing to the same firefox.exe on C:\. Both used my profile, but one kept telling me that FF was not the default browser. The other checked and found no problems with default. If I delete her installation, my second icon goes away, but so does her FF. If I delete my installation, Firefox deletes in both accounts. My work around is to pin the "correct" icon in my account to the taskbar and just use that, leaving her account unaffected. Its obvious that both installations are using the same program file location, so I tried deleting her installation and then creating a shortcut to the program, which would use, I hoped, her profile - still in her roaming directory. But Firefox is not in her C:\. Its not a "shared by everybody" program. So that idea died a horrible death any ideas? There's cross-talk between the accounts but access to the main program is denied unless its installed for each user. This is new to me, and we've had separate accounts on my old laptop, as well as on a desktop up until she got her own desktop at home. your assistance would be appreciated. Firefox 55.0.3 (64 bit on Windows 10 home, HP Pavillion 360 laptop)