http://kb.mozillazine.org/Profile_folder_-_Firefox#Navigating_to_the_profile_folder

https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible

Good luck.

thank you so much for this information. it helped me to locate my current profile, which is on my new hard drive. but i need my old profile, which evidently perished along with my old hard drive. i was unaware that the profile is stored on ones hard drive---duh. guess im out of luck. but your links will form the foundation of my new bookmarks, so i truly appreciate your taking the time to reply. all the best!

Look on your desktop. Do you see a folder called; Old Firefox?

https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile

https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible

no, i do not see such a folder on my desktop.

It is possible that there has been a problem with the profiles.ini file that registers profiles and that a new default profile got created.

You can check that by opening the current profile folder and go up one level.

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

• Help -> Troubleshooting Information -> Profile Directory:
  Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder
• http://kb.mozillazine.org/Profile_folder_-_Firefox

Do you see only one profile listed?

• C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\Profiles\

thank you for your reply. the only profile i can find is a new profile on this new hard drive. but i need the old profile, which is on my old hard drive---which was damaged by the power surge and replaced. i dont think there is any way to access my old profile short of recovering it on the old hard drive, which i cant do.

If that old hard drive is fried beyond access then I'm afraid that your bookmarks and other personal data is lost if you do not have any backups.