Jo3Bingham

Uninstall CCleaner and Firefox, reinstall Firefox, go to your favorite sites and save your passwords. Next, go to Control Panel -> Folder Options -> View (tab) and make sure 'Select hidden files and folders' is selected. Reinstall CCleaner and go to Options -> Exclude. Click 'Add File' and navigate as so; C:\Documents and Settings\<user name>\Application Data\Mozilla\Firefox\Profiles\xxxxxxxx.default\signons3.txt. The 'xxxxxxxx.default' folder isn't really labeled that, but I'm pretty sure the xxxxxxxx part is different for each user so just look for a folder that has .default in the name.

I fixed it by reinstalling Firefox and adding it's signons3.txt file to CCleaner's exclude list.

After installing CCleaner v2.19.901 Firefox quits saving my passwords. They're still in my Saved Passwords list, but when I go to a site where my password is saved I'm no longer auto-logged in.