Please let us know if this solved your issue or if need further assistance.

https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data Should have tried to recover your profile first... https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles Please let us know if this solved your issue or if need further assistance.

If profiles.ini is really removed then Firefox should create a new default profile and you should get the profile migrator asking to import data from other browsers. So it sounds that there is still a problem with profiles.ini. Were you able to find profiles.ini? What security software do you have? Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems. *http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/ *http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10