You would need to use software like recuva to restore such, and there is a low chance you can get everything back, but anything is possible.

• http://www.piriform.com/recuva

yeah I used recuva then what should I do?

Best is to first find and undelete the previous profile folder and then undelete the bookmarkbackups folder in it with the JSON backups (bookmarks-####-##-##.json)

If you can recover an uncorrupted JSON back then you can use it to restore the bookmarks.

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

• https://support.mozilla.org/kb/Recovering+important+data+from+an+old+profile
• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

There isn't any .json files in there.

You will first have to undelete such a JSON backup in the bookmarkbackups folder with Recuva before you will see it.

Yeah I used recuva but the list recuva gave me there was not any .json files in there to recover.

Are you sure that you searched in the correct location (\AppData\Roaming\)?

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

yeah I did.

Did you check the file dates of the folder and possible files in the main profile folder to be sure that you got the correct profile folder?

Are other files in the main profile folder marked as recoverable?

There isn't any file remaining there and the bookmark backup folder is empty too, Here is the image of the recuva.

Did you try to restore the two profile folders marked with a green icon?

No I did not. Should I recover them?

Those two are just normal FILE they do not have any format.

Files with a name like this still look like files in the disk cache.
I can't see the full path including the name of the files that appear in the screenshot, so I'm not sure what you are seeing.

Some of the files appear to have been overwritten by Kaspersky anti-virus software.

The two files I recovered which were marked in green

There you go.