Just found out my computer has been hacked through firefox. do you have a scan to prevent this from happening

Facebook informed me that my account had been accessed from somewhere in Washington using my browser, Firefox.

Thanks for your comments. I generally keep it quite secure. I did open it up for a short time to serve some e-mail accounts. But, shut that down when all this happened. I also do intend to become somewhat of an expert on this, and I have read a lot on many sites over the past few days before posting here. However nothing I could find answered my questions directly.
As for the post being general, the first 3 paragraphs were to describe what happened. I just figured that the background might be helpful. The question(s) themselves were in the fourth paragraph. I guess I might have been vague. So, let me try to restate them again.
My questions are as follows: (1) do the facts that I have relayed give a strong indication that my computer was hacked into or could they just be erroneous behavior? (2) How can I tell if someone has logged into my system (whether they hacked in or not); and (3) where can I find in the system when someone has logged in and for how long they were logged into my computer (again, whether they had permission or not)? Seems like the answer to both of these questions should be in a log file somewhere.
A bonus would be if I could track where they were and what files they accessed, but I believe that is not possible under OS X, without some extra software that I did not have installed at the time.
Thanks again. I appreciate any input here. It is unnerving to have someone access your computer without permission.

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