.ZIP (and other container formats) downloading error
Whenever I try to download and open an archive file with Firefox, Windows tells me that the file is corrupt. But when I go back and get the file in Internet Explorer, it works fine. What gives??
Alla svar (1)
It is possible that your anti-virus software is corrupting the downloaded files or otherwise interfering with downloading files by Firefox.
Try to disable the real-time (live) scanning of files in your anti-virus software temporarily to see if that makes downloading work.
See "Disable virus scanning in Firefox preferences - Windows"
See also: