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Firefox automatically starts a scan for viruses whenever a download completes. It can get annoying when we download images or less malicious files from trusted sites, when you have to wait for a few seconds to do an action via the download modal. Here’s how you can disable it.
Like for any firefox tweak, in your browser window, type
in the address bar and search for “scan”. It should bring up
Double click the property to toggle it to false.
That’s it. You have successfully stopped Firefox from doing an automated virus scan each time you download a file.