User Agent: Mozilla/5.0 (Windows NT 5.1; rv:19.0) Gecko/20100101 Firefox/19.0 Build ID: 20130215130331 Steps to reproduce: I'm using Firefox 19.0. I submitted data using http:// . At least until Firefox 15.0.1, a confirmation dialog セキュリティ警告 あなたが入力した情報は暗号化されていない接続を通して送信されようとしており、 第三者が簡単に傍受できます。 本当にこの情報の送信を続けてもよろしいですか？ (Above is Japanese message. English message would be security warning: The information you have entered is to be sent over an unencrypted connection and could easily be read by a third party. Are you sure you want to continue sending this information? ) was displayed. But the dialog is no longer displayed in recent Firefox versions. security.warn_submit_insecure was removed or renamed? If so, security.warn_submit_insecure should not be shown in the about:config page. Actual results: Warning dialog no longer be displayed. Expected results: Warning dialog should have been displayed.

This pref got removed with bug 799009 >If so, security.warn_submit_insecure should not be shown in the about:config page. This pref doesn't exist unless you modified it. Resetting the pref and restarting Firefox should make it disappear