fix *.run_html for FireFox
fix *.run_html for FireFox

perhaps related:
http://agilerails.wordpress.com/2009/05/27/ie-throws-file-download-security-warning-on-form-submit/
concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse