There was minor issues when Firefox changed things, which DownloadHelper was able to correct within days. Once the app for Download helper was added to my computer, all downloads have been quick and easy avoiding the watermark or tag in left hand corner. I just have to remember not to download through Firefox (where it prompts you to changing format, even when already in MP4) but through app to avoid the watermark, but all MP4 videos download easily. It is a great tool for viewing programs that have been uploaded to the net, such as TV shows that are no longer shown on television. I will be donating as well.