Tired of Firefox running a scan every time you download something? Follow the instructions below to disable the download scan.
Mozilla Firefox Download Scan
In your address bar type “about:config” and hit enter.
Click the “I’ll be careful, I Promise” button.
In the search bar type “scan” and press enter.
Double click on the entry that says “browser.download.manager.scanWhenDone”. This should turn dark and give it a false value. And now Firefox will now longer scan every download.