Disable "Although this page is encrypted...." in Firefox 14
If you want to disable the warning message which says: "Although this page is encrypted, 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?"
Type in "about:config" in your Browser's address box. A caution box will open, just agree to be careful. When the page opens, scroll down to: "security disable_button.OpenCertManager" and double click on it and change it from True to False. Do the same thing with the one below that:"security disable_button.OpenDeviceManager". Close the page and the annoying and unnecessary warning will not pop-up again. I just did it, so I know it works.