I regularly download a zipped csv file, of the format: "filename.csv.gz". As the name does not change, Firefox adds a digit to distinguish it, so for example I get "filename.csv-3.gz". This is a pain as it changes the file extension which means that I cannot open the extracted file without first renaming it. I want to keep an archive of all the files, so deleting them each time isn't really an option, and neither is moving them to a different location each time. Is there any way the naming convention for downloads can be changed?