Firefox - Disable download checker

February 2017





When Firefox has finished downloading an application, image, video, etc.., It checks if there is no virus in the downloaded file. The problem is that the larger the file is, the longer it will take to audit. In addition, this feature seems to be ineffective.

If you want to disable this feature, follow this procedure!
  • Open Mozilla Firefox
  • In the search bar, type:
    • about:config
  • Click I'll be careful, I promise!
  • In the search bar (filter), copy and paste this:
    • browser.download.manager.scanWhenDone
  • Double click on browser.download.manager.scanWhenDone
  • Restart Firefox




Here, the feature is now disabled! But always scan a downloaded file with your antivirus.

Note that: on some versions of Firefox, this method can crash the browser after downloading. If this is the case then set browser.download.manager.scanWhenDone tp true

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Published by jak58. Latest update on May 24, 2010 at 06:26 AM by jak58.
This document, titled "Firefox - Disable download checker," is available under the Creative Commons license. Any copy, reuse, or modification of the content should be sufficiently credited to CCM (ccm.net).