Debug HTTPS errors

When accessing my site, the SSL session is successful while the page loads. A few seconds after 开发者_StackOverflow社区the page loaded FireFox shows that SSL is no longer available.

I am guessing its some script (all I have is Google Analytics and Facebook). How can I see what caused FireFox (or IE/Chrome) to drop the SSL and why ?

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Have you tried firebug? It should show you what is going on.