about:config
browser.download.manager.scanWhenDone    change to False
browser.ssl_override_behaviour           change to 2
network.http.max-connections             change to high number

browser.download.manager.alertOnEXEOpen  = False
browser.download.manager.skipWinSecurityPolicyChecks = True
browser.download.manager.scanWhenDone = False
browser.xul.error_pages.expert_bad_cert=True