See these support articles. Profiles - Where Firefox stores your bookmarks, passwords and other user data Back up and restore information in Firefox profiles

Hello ed, I tried to copy and paste the profiles years ago without luck. They seem to have changed so I will try again. Can you tell me if the "sync" feature will work as well?

It is best not to copy a full profile, but only the most essential files that you really need especially if you copy to a different OS.

So start with the bookmarks and history (places.sqlite) and the password files (signons.sqlite and key3.db).

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
• http://kb.mozillazine.org/Profile_folder_-_Firefox

You can use this button to go to the currently used Firefox profile folder:

• Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)