places.sqlite contains your History and Bookmarks.

Open the backup folder, locate that file, and Copy it to your new profile as is. If asked, overwrite the current file.

A JSON backup file from the "Bookmarkbackups" folder in the "Old Firefox Data" folder would need to be restored !

Import is for use with bookmarks.HTML files which were exported from Firefox or another web browser which is capable of exporting in bookmarks.html format.

As Fred mentioned, better to use the places.sqlite file as it has more of your data - browsing history and bookmarks. Copy & overwrite the "existing" new Profile's places.sqlite file, with Firefox closed.

When places.sqlite file is missing then Firefox will automatically try to rebuild the bookmarks from the most recent JSON backup in the bookmarkbackups folder. So you can remove places.sqlite and only copy the bookmarkbackups folder.

Note that places.sqlite is in the main profile folder and the backups are in a sub folder named bookmarkbackups.

• ~/Library/Application Support/Firefox/Profiles/<profile>/

In Mac OS X v10.7 and later, the ~/Library folder in the Home directory is a hidden folder.

• http://kb.mozillazine.org/Show_hidden_files_and_folders#Mac_OS_X

• https://support.mozilla.org/en-US/kb/restore-bookmarks-from-backup-or-move-them

Thanks to FredMcD, the-edmeister, and cor-el for their quick replies. Their suggestions worked great and I am back up and running!

Glad to help. Safe Surfing.