The backup that you used, did you keep it up to date?

What about your history? Any problems? Note, these are kept in the same file.

Places Maintenance {web link} Allows to run Maintenance tasks on the database that drives Places, the bookmarks and history module behind Firefox.

Open the Add-ons Manager. Locate the add-on and press the Options button. Then follow the directions.

Yes, my history for the whole computer was done hourly. And everything else is fine.The history doesn't show the bookmarks either . . it's has a few book marks from like 6 years ago.

krisward said

Yes, my history for the whole computer was done hourly

Please explain what you mean by this.

Did you backup the Firefox profile folder before restoring the computer?

You would have to restore the bookmarks from a JSON backup or restore the places.sqlite if your Firefox profile folder was restored as well.

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

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

You can copy files like these to the current Firefox profile folder to recover specific data.

• bookmarks and history: places.sqlite
• bookmark backups: JSON backups in the bookmarkbackups folder
• SQLite files like cookies.sqlite (cookies) and formhistory.sqlite (saved form data)
• logins.json and key3.db (decryption key) for Passwords saved in the Password Manager
• cert8.db and possibly cert_override.txt for (intermediate) certificates stored in the Certificate Manager
• persdict.dat for words you added to the spelling checker dictionary
• permissions.sqlite for Permissions and possibly content-prefs.sqlite for other Site Preferences
• sessionstore.js for open tabs and pinned tabs and tab groups