This is thr ONLY video downloader I have found in Firefox that works and I've easily tried 10-15. The interface is clunky, requiring a cut-n-paste of the URL and sometimes the recommended retry is required. But worse, stats about the video are not displayed in the file manager after the video is downloaded. It seems to play but in the player, the total time is undisplayed. It's like having a corrupted video that is unindexed.