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How do I disable the shortcut control-shift-n in firefox?

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That shortcut is used by another program on my computer but instead brings up a "page not found" message in Firefox

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Hello Mom21,

Shift+Ctrl+N is the command to restore the last closed window from History > Recently Closed Windows.

There is an addon called Customizable Shortcuts you could use to change this shortcut. Please see the following article.

Find and Install add-ons to add features to Firefox

Let us know if this solves your issue.

Cheers, Patrick

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There are other things that need your attention.

Please Update to the latest Firefox 20.0.x version.

  • Help > About Firefox

The Firefox Firefox 8.0.1 version that you currently run is no longer supported with security updates