hello tasu, this depends on how you have reinstalled your operating system (have you formatted your harddrive in the process?) - if you can still find the profile folder of your old installation on the disk, then you will be able to restore data from it: Profiles - Where Firefox stores your bookmarks, passwords and other user data

in case you have neither used sync before or have any other backups available then i fear there is no way restoring this data...

yea i didnt do a backup...: ( neways thanks..

You can check if Windows has created an C:\Windows.old folder.

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