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Firefox: Virusscan off

  • Oct 31, 2025
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In Firefox's built-in Virusscan, you can turn it off, because most of the virus check programs downloaded files for viruses automatically. In order to prevent a double Scan, and conserve resources.

To turn off the Virusscan

  1. Navigate in Firefox to the address bar and type the Text "about:config". Confirm the security note.
  2. Enter in the "Find:"field, the term "Scan".
  3. The first recorded entry in browser".download.manager.scanWhenDone". Under "value" is this entry to "True".
  4. To set this entry to "False" and, therefore, to disable the Scan, double-click on the entry.
Virusscan on Firefox shutdown
Has been tested on Firefox 23.0.1. As you saved passwords in Firefox to delete, you can learn here.

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