FF 20.0 now opens with tabs that I closed in previous sessions even when I close without checking the open tabs box. How to fix?

OS 10.7.5; FF 20.0

Firefox will automatically resume your previous session if it detects that it crashed. I'm not sure how to troubleshoot that on Mac, but you could check out the "Firefox hangs when you quit it" part of this article: [[Firefox hangs or is not responding - How to fix]].
You might also want to review your home page setting as some tabs might appear there that weren't intended to open every time you start Firefox:
Firefox > Preferences > General

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