If you are using Firefox as your default browser, then you might have saved bookmarks, passwords and other add-ons installed. Firefox is prone to crashes like other browsers and hence it is always safe to keep a backup of your Firefox Profile. Batckup Firefox is a simple freeware tool which runs in the command prompt and instantly backs up all your Firefox profiles to your desktop.
Just run the .bat file and it automatically detects the installed Firefox and the user profiles created. The profiles are backed up on the desktop as separate folders. The Firefox profile along with bookmarks ,favorites etc will be saved in a folder on your desktop.
Although the same procedure can be done manually, this batch file will do it in a single click.