Incorrect number of new mail - Firefox

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An incorrect new mail count under Tools is a Windows bug.

  • If you have TweakUI, go to Repair > Repair Unread Mail Count and Click "Repair Now".
  • If you don't have TweakUI, Start -> Run -> regedit, navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\UnreadMail\account and delete or modify the MessageCount values in the account sub-keys [1].

Because of this issue, this feature was removed in Firefox 2.0. [2]