Alright here are the instructions...
Open the folder C:\Documents and Settings\<your username>\Application Data\Mozilla\Firefox\Profiles\<some random numbers and letters>.default\bookmarkbackups.
Take the lastly created bookmarks-<year>-<month>-<day>.json file and copy it to your desktop.
EDIT: Delete the entire Application Data\Mozilla folder.
Start Firefox, a new profile will be created.
Click on Bookmarks, Show All Bookmarks.
Click on Import and Backup, Restore, Choose File.
Browse to your desktop and double click the .json file.
Your bookmarks will be restored minus the favicons.
You'll have to set your preferences again and reinstall any extensions you had.
Start a thread in the Am I infected? forum and let them check you out.
Edited by .X., 21 August 2013 - 05:48 AM.