Normally Firefox captures disk space progressively as a file is downloaded. So it can come to a situation when you download 99% of a file to know it can't fit on your HDD or download 50% of 2 files and lose them both instead of saving 100% of one of them.
Can this behaviour be altered so that Firefox will write a full-sized dummy file on download start and replace its content with actual data as downloading? Some download managers have this in options, for example, but I prefer using standard Firefox built-in downlad manager.
