I get this same error in both 1.5 and 1.6 on Mac OS X, "Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.6) Gecko/20040113". The URL is: https://www.taxactonline.com/s_online_tax/introduction/registration.asp Fill in the form and click the "Submit Registration" link.
Possibly related to bug# 248402 ?: Scripts running in an https context throws this exception when a call is made to non-https DOM content, even when the http-host is identical.
Assignee: security-bugs → dveditz
QA Contact: carosendahl → caps
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