Option to replace file with same name on download

[Gavin AutoTester]

Is there a way to have the browser automatically replace a file with the same name if it exists?

Example:

1. Test downloads file called sample.csv 

2. Re-run test

3. Test downloads file called sample(1).csv

Is there a way(a preference) so that when downloading the file it will just replace sample.csv instead of downloading a new file?

I have the usual preference set up for file downloads

fxProfile.setPreference("browser.download.folderList",2);
    fxProfile.setPreference("browser.download.dir","c:\\mydownloads");
    fxProfile.setPreference("browser.helperApps.neverAsk.saveToDisk","text/csv");

[Mark Collin]

If you did that how would you know that a new file had downloaded, and that you aren't checking the existing file?

Have a read of this:

http://ardesco.lazerycode.com/index.php/2012/07/how-to-download-files-with-selenium-and-why-you-shouldnt/