Firefox Error Message “filename part could not be saved, because the source file could not be read”? ← Knowledge Base This error is encountered when either your internet connection is slow or your Firefox download configuration is corrupted. Pls. follow the instructions posted at http://kb.mozillazine.org/Unable_to_save_or_download_files to try fixing this. If this does not fixes the problem do send us a http://www.speedtest.net/ report link, we would also suggest you to try using the Chrome version of the addon a try from - https://chrome.google.com/webstore/detail/easy-video-downloader-exp/bgbkjhdpjeoniphgfchbpflipaclmemd so the Firefox only problem factor can be ruled out decisively.