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When you speak of "Firefox email," are you meaning that you formerly used Thunderbird (Mozilla's email application)? If so, it will still be installed but the Windows 10 upgrade will have relegated it into the Start menu. To find it, click your START button (the Windows logo in the lower left corner), click ALL APPS (the last option in the Start menu), and then browse the list of installed programs to locate Thunderbird. Once you find it, you can right-click it to add a shortcut to your Start menu or taskbar.
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