FF has so many extensions that you forget them all. when you reinstall windows you forget most of them
if this is you, then this guide is for you.
download the synctoy from powertoys. here is the one that don't require ms snooping (validation)
you need net framework 1.1 to install this
open it. pick create new folder pair. Head to C:\Documents and Settings\Your Username\Application Data\Mozilla\Firefox\Profiles\odnkhrlu.default\fol der
make you a new folder elsewhere (preferably a different partition) name firefox backups. browse there for your destination folder. click synchronize.
when you reinstall windows just copy and paste those contents back to that folder and your saved setting are put back in place. your bookmarks, your google info ad your extensions are there