How to Repair Mozilla Thunderbird

Written by jordan baughman
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How to Repair Mozilla Thunderbird
(Pixland/Pixland/Getty Images)

Mozilla Thunderbird is a mail client that uses the same code base as Mozilla Firefox. Just like Firefox, Thunderbird can suffer profile locks that block you from accessing the service. The error message reads: "Thunderbird is already running, but not responding. To open a new window you must close the existing Thunderbird process, or restart your system." You will need to remove the profile lock by deleting all Mozilla processes from your Windows taskbar.

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  1. 1

    Access your Windows Task Manager by pressing the "Ctrl," "Alt" and "Delete" keys simultaneously.

  2. 2

    Left-click the "Processes" tab.

  3. 3

    Highlight each Mozilla process and then press the "End Task" button located at the bottom right corner of the window.

  4. 4

    Close the Windows Task Manager.

  5. 5

    Restart your computer to finish repairing Mozilla Thunderbird.

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