The proxy adds a layer of complication that will make this extremely difficult to diagnose. Try it without the proxy and report back; that will help isolate the problem.
A shot in the dark is that if it's only secure sites affected, Firefox's security settings may be improperly set. You'll find them under Preferences>Advanced (I think Preferences is under Tools in Windows, but I can't remember for sure out of hand).
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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