As great as it is to have tools such as Firefox and Thunderbird, backing user profiles and all their moving parts can be a tedious process. MozBackup is a tiny program that makes saving and restoring all your bookmarks, extensions, and other personal settings a streamlined and stress-free experience. It's dead simple to use because it walks you through both the backup and restore features. So, for example, even if you've backed up everything but you only want to restore your bookmarks, you can do that easily.
The program works with Firefox, Thunderbird, SeaMonkey, and Netscape on Windows platforms. It doesn't work with Firefox Portable, Sunbird, Songbird, or Flock, but for standard Windows iterations of the programs in the Mozilla suite, it's almost silly to not use this program. If you've got a specific or a complicated set of extensions and settings on your work machine, and merely thinking about how to transfer them makes you want to revert to using an Underwood, MozBackup should quell your fears.