Let's say you're downloading a large video file and you want to watch it while you're downloading. In ff2, you could right click on the link, say "save target as", and then it would start downloading to 1 file - you could click on it and view it - no problems. But in 3 - all data is written to these stupid ".part" files - you can view these also, but if they're still open when the download finishes, ff gives you an error and tells you that you need to re-download.
Is there ANY possible way to get rid of these .part files and have ff save to just 1 file?