Firefox Disable / Hide New Tab Page

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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?

nginx: Send HTTP User Agent Requests To Specific Backend Server

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I‘ve tons of images, css and javascript hosted at backend server IP 192.168.1.5 and 192.168.1.6. How do I make sure nginx reverse proxy load balancer always send all http_user_agent requests coming from “Mozilla” to server 192.168.1.5 and MSIE to server 192.168.1.6 only?