No problem that is the standard Firefox bookmarks format. BUT TAKE CARE, always make separate backups before trying importing such bookmarks as they overwrite any existing bookmarks.

• see Back up your bookmarks or move them to another computer
  • edit link is Restore bookmarks from backup or move them to another computer

Also before attempting your year old restore

• that note you could have other backups generated automatically, so read the above linked article
• consider trying to find and backup your profile that normally contains useful bookmark files (including places.sqlite which if not corrupt is a complete history and bookmarks database)
  • see Back up and restore information in Firefox profiles

Post back with how you get on, or if you need more assistance after looking at the linked articles.

Alright I tried to follow what the aritcle said and it didn't work to well. I pasted %APPDATA%\Mozilla\Firefox\Profiles\ into the run menu and got the profiles folder inside firefox.

I clicked on the bookmarksbackup folder and found the json file. but it said backup.
I pasted my old json file in there and deleted the other one that was there. 

I restarted my computer and got no results. my bookmarks didn't show up. is there another place that i need to paste this file instead of the backup?

You need to restore the bookmarks manually from the JSON backup or delete all places files in the Firefox Profile Folder to force Firefox to rebuild the bookmarks.

• Bookmarks > Show All Bookmarks > Import & Backup > Restore > Choose File

• http://kb.mozillazine.org/Backing_up_and_restoring_bookmarks_-_Firefox

Wow!!! cor-el Thanks it work well and easily!!

You're welcome