I am having trouble with downloading a zip file. When I do, it gives me the error message (filename) could not be opened, because an unknown error occurred.

(filename) could not be opened, because an unknown error occurred.
Try saving to disk first and then opening the file.

*kb.mozillazine.org/Unable_to_save_or_download_files
*https://support.mozilla.org/en-US/kb/cant-download-or-save-files

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