From NirSoft Freeware:
FirefoxDownloadsView utility displays the list of the latest files that you downloaded with Firefox. For every download record, the following information is displayed: download URL, download file name (with full path), referrer, MIME type, file size, start and end time, download duration, and average download speed. You can easily select one or more downloads, and then save the list into XML, HTML, text, or csv file, or copy the downloads information to the clipboard and paste it into Excel or other spreadsheet application.
What's new in this version:
Version 1.36 adds UseNewFirefoxDM command-line option.