Mac OS X

I‘ve upgraded to Firefox v13. However, I don’t like the new tab page. I’m concerned about my privacy. How do disable or hide new tab page while using Firefox browser version 13? How do you get rid of the “new tab” page that shows recently visited pages?
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I‘m using a Mac OS X and combination of ssh-agent+ssh-add to adds RSA or DSA identities to the authentication agent. ssh-agent provides me a secure way of storing the private key. However, I’d like to expire identities added to the agent within half an hour. How do I set lifetime of identities added to the agent under Unix / Linux / BSD / Apple OS X operating systems?
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