Hi, you can but some rules/info to learn.

Alway's :

• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

Profile

• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data
• https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

Please read :

• https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Multiple_profiles

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

Please go to Help --> About and update to version 62

Try using a separate Windows Logon User Account. { LUA } https://support.microsoft.com/en-us/help/17197/windows-10-set-up-accounts

That will keep everything you do on a shared computer in your own separate section. That includes a completely separate Firefox Profile, and separation of your data for other applications, too.

IMO, far better than creating and dealing with separate Firefox Profiles, as it is "automatic" and requires no specific of Firefox or any other application. It's almost like you and the other Windows Logon Users Accounts are each on their own computer, other than the not being able to use the PC while other users are using it.