Mozilla Firefox stores all your personal settings, such as bookmarks, passwords and extensions, in a profile folder, which is stored on your computer. To back up your profile, restore it, or move it to a new location or computer, all you have to do is move or copy the profile folder.

For instructions on how to locate your profile folder and copy the contents of this folder please visit the Mozilla Help Site:  http://support.mozilla.com/en-US/kb/Backing+up+your+information