Interesting Paradox between IE and FireFox

Interesting Paradox between IE and FireFox

For some reason till last week when I logged onto my Wordpress Administration Control Panel, if the web browser I use is Internet Explorer it used to alert me "This page is redirecting to a non-secure site" warning. If it is Mozilla FireFox, then it used to silently logon without any  demur of any kind.

Quite interesting paradoxical behavior right? There has'nt been any change in behavior in other non-IE browsers like Opera, Konqueror (on Red Hat Linux).