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How To Back Up & Restore Mozilla Firefox & Thunderbird [Windows]
Firefox stores a surprising large amount of data for you. Passwords, cookies, certificates, extensions and more. Thunderbird, while an overall capable email client, does not provide built in tools for backing up and exporting email accounts. Fortunately there is one free program which handles all exporting (backing up) and importing of these programs as well as many other Mozilla products: Mozbackup.