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Firefox truncates filenames that contain spaces at the first occurrence of a space if private filesystem is enabled.
The issue is explained here: http://kb.mozillazine.org/Filenames_with_spaces_are_truncated_upon_download
I think the end of function filefield_file_download($file) needs to be altered to enclose the filename in quotes, like this:
return array( 'Content-Type: '. $type .'; name='. $name, 'Content-Length: '. $file->filesize, 'Content-Disposition: '. $disposition .'; filename="'. $name . '"' , 'Cache-Control: private', );