Firefox 3 makes a call to your anti virus software to scan your down loaded file. This typically results in a double scan or an unnecessary scan when you trust the download source.
There is no intuitive way to disable this feature but thanks to gHacks I was able to find a configuration setting for this feature.
You can navigate to about:config in Firefox and double click the browser.download.manager.scanWhenDone to set its value to false. No more time wasted scanning the file.
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Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in anyway.