MozBackup

MozBackup is a free utility that lets you back up all data in the browser.

MozBackup
MozBackup
With MozBackup can save the following settings from Firefox, Thunderbird, Sunbird, Flock, Firefox, Mozilla Suite, Spicebird, Songbird, mailbox, comfortable Wyzo and Netscape:
E-mail folder
markers
catalog
History, Sidebar, Cookies
Saved Passwords
All program settings


In version 1.5.x company recently published MozBackup with Firefox 4, you can create backups over 4GB. All changes and new features can be found in the list of changes in the manufacturer's website read.
MozBackup